I believe the reason why is that knowing everyone in the community would literally be a full-time job and no one wants to pay for that.
It is especially the case that it should prioritize braking in uncertainty when it's a lonely road with no one behind
Simplest answer: twitter is where everyone else is, which makes it the simplest and easiest way to interact conversationally with potentially anyone on earth without an intro or in-person meeting.
In addition, twitter enables easy one-to-many communication for celebrities who want to spread memes, and brevity is the soul of wit.
That just makes an opening like "I have become very, very interested in developing a skill that I call Dependability." even more annoying to me.
I disapprove of the lesswrongy tendency to try to coin new words or new meanings for old words for concepts that already exist and are useful.
Walmart coordinates 2.2 million people directly and millions more indirectly.
Even the boy scouts coordinates 2.7 million.
Religions coordinate, to a greater or lesser extent, far more.
The key to coordination is to not consider yourself as an individual measuring out a ration of words you can force x number of people to read. Most people never read the bible.
The sensation of new 'vistas' of options and subjective preferences opening up is a very familiar one to me in a similar way from a combination of a) getting actually good socks and shoes and b) lifting sufficient weights that my legs are strong enough to lift me up stairs/hills easily. Doing a bunch of squats once a week means that if people happen to be walking together and we go up a hill i'm no longer suffering, I'm doing fine, and this similarly means that a lot more things which would be terrible are fine journeys.
To people in general I strongly recommend getting your feet measured in width and height as well a length, and shopping around for shoes that actually fit if you can, as this makes a huge difference in how long you can walk before your feet start to hurt. In addition, things that you don't really think about like sole thickness and material and sock materials can make a surprisingly large difference.
I think an under-appreciated aspect is suspicion of Officially Altruistic behavior. A ton of things people do even in countries that weren't run by communists that appear to be altruistic are actually self-enriching, and in addition a ton of things people do to help the less fortunate actually end up hurting them. I would yell at a lot of people if they started ostentatiously saying they were sacrificing for my benefit when I had never asked them to, and you could easily frame that as "anti-social punishment" if you BELIEVE that they're actually helping, but from a suspicious perspective they're both probably not actually helping me and they're also helping themselves.
I liked this at first, but about 6-7 paragraphs of back-and-forth in I got really tired, started skimming, and then realized it went on for way more pages.
I get that your internal experience of trying to talk to people about AI risk feels like going on and on in this sort of "humble and correct person argues with smugly incorrect person forever" way but I don't think that's a good format for actually convincing people.
Something I've been thinking of doing is asking a lot of specific people I like who else would have to move somewhere before they would move and seeing if there's a smallish cluster