Naively, you would think this kind of thing would be a trade off between the size of your free space, the probability that the kept item will be useful, and the cost of just getting another one of those items in the case that it is needed. (For example a large object, that takes a lot of space, that is unlikely to be useful again, and could be replaced cheaply in the unlikely event that it is useful, is a bad keep).
However, in my experience a much bigger issue seems to be memory space. I end up with curtains I don't need. I decide to store them for the future in case they are helpful. Years pass. I need new curtains. I have forgotten the ones I kept, so I buy new ones and put them up. Months later I find the ones I kept while looking for something else. This kind of thing (actually knowing about the weird stuff you have kept and remembering it when its needed) I think is (for me) actually a very large barrier.
I think this depends a ton on how your brain happens to work. Some people forget things, and get minimal benefit from having things stored. Others find that having stuff weighs on them mentally [1] and minimalism frees up brainspace. And then for others it's neither [2] and they just get the benefit as you'd model in your first paragraph.
In my case, things don't weigh on me at all, and I usually (but not as well as some others) remember what I have stored when it could be relevant. But other times I'll just go and walk around the basement with an idea in mind to see what might be useful, using the world as its own representation.
[1] See this fb thread: "I am a bit suspicious of how both you and Jeff talk about this. I don't think people are reliable narrators of how much cognitive load something is taking, when that load feels pleasant." Also this LW comment: "excess material is like a pressure on my mind until it's properly stored, sold, donated, or otherwise disposed of."
[2] Another person in the same fb thread: "I can remember where I put a specific doohickey that my brain labeled as "this could be useful" years later with very little recall effort; something will come up that actually matches the need for the thing, a little triumph, and I go to the spot where I buried my acorn and get it."
I think this post would be strengthened if the first line contained information about how much "free space" you have for junk. Afaik most people into minimalism live in small spaces like flats, and don't have extra storage like a basement.
This did a great job of expressing what many crafters, builders, and hobbyists must feel - that accumulated random material is worth keeping because it lowers the barrier to executing odd projects.
I don't share the feeling, however. Excess material is like a pressure on my mind until it's properly stored, sold, donated, or otherwise disposed of.
Hand saws are awesome! Much less dust, noise, and danger than a powered saw, and no cables to manage/batteries to charge/fuel to keep around. Sure, power tools are great for bigger jobs, but for small work (or enjoyment) a sharp handsaw is so much better. Plus, sharpening and tuning a 100+ year old saw and having it fly through white oak is super-satisfying. I admit this pretty much totally misses the point of your post, sorry...
Each to their own of course, but big handsaws can work very fast and well. I wouldn't use them much if my job was mass-production, but for use around the house I think they are widely underrated. The saw shown in your pictures appears in desperate need of jointing and sharpening (on a zoomed-in image you can see that the teeth are not consistent shapes or sizes). Jointing is described here: https://workshopcompanion.com/know-how/tools/sharpening/hand-saws.html There are loads of videos on youtube on sharpening. If you want to get into this, of course ;).
Occasionally people will get excited about a minimalism fad, where you figure out which of your possessions you need and keep only those. As someone who generally doesn't like getting rid of things, I've been thinking some about why, and the main thing I keep coming back to is that random objects can be helpful in unpredictable ways. Here are some things that I kept without a specific use in mind, but that ended up being useful. You could say they saved time or money, but often the biggest gain was from being able to do a project in one go with what I already had on hand:
Ethernet cable. Back in 2019 if you'd asked me whether I would ever use ethernet again, I would have said probably not. WiFi was good enough for everything I was doing. But then I (like a lot of us) suddenly started working from home and got frustrated about how poorly my internet was working for video calls and ran ethernet to my desk. Having cable on hand already meant I could just set it up.
Plexiglass. When I built my accidental electronic instrument I wanted to protect it, and had plexiglass left over from when I added an insulating layer to a single-pane window.
Scrap wood. So many things. To give one example, when one of the stairs in our basement fell apart, I was able to replace it with extras from past projects that I'd kept around.
Similarly, when Lily came back from visiting a friend enamored of their prop axe, she had everything she needed to make one already in the basement:
Computer mouse. One of my housemates was having wrist issues, and wanted to try out using a mouse on the floor. They ended up hating it after a day or so, but being able to pull one out of the junk electronics pile and try it made for quick experimentation.
Plastic sheeting. When we wanted to divide our apartment in two so we could isolate a new housemate I had sheeting left over from an earlier project.
Screen. When I wanted to make a screen door for our kid door I already had window screen lying around.
Hinge. Lily wanted to make a "laptop" for Anna as a present, and I had an old hinge lying around from who-knows-what that was just right for having it stay open at the right angle. Here's the laptop after Anna decorated it:
And with the hinge it closes just right:
Volleyball net. When we went back to the vacation house where Nora had a close call with a fountain, we wanted to put up a barrier. The kids would probably have been fine without, but we wanted something that would clearly mark it as out of bounds. We got some chicken wire, but realized when we were packing that it was only about half as long as we needed. An old volleyball net made up the difference:
Hand saw. I would have said there's no situation in which a traditional manual crosscut saw is the best tool for the job, but when the city cut down the tree in front of our house for being diseased, Lily wanted a piece of the stump to remember it by. She really wanted to cut it off herself, without assistance from electricity or other humans. Luckily, I still had the tool for that:
She did change her mind on help after realizing how hard it was, though I don't think Nora was very helpful:
Having a wide range of objects in the basement is something I find useful on a regular basis. One thing I like about projects is that they often leave me with interesting scraps I can use for other things. I especially like that they're not very valuable, because that means I feel much more free to play with them.
If we were moving often, or didn't have a large unfinished space, of course, the tradeoff would be different. And many things go into the basement never to be used again (so far!) Since we do have the space, though, keeping things without knowing what we might need them for seems well worth it.
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