I'll suggest the main change is open threads get fewer comments because the system makes open threads less conspicuous, and provides alternatives, such as questions, that are decent substitutes for comments.

I think the Hypothesis is not about Open Threads specifically

Open Thread July 2019

by ryan_b 1 min read3rd Jul 201992 comments


If it’s worth saying, but not worth its own post, you can put it here.

Also, if you are new to LessWrong and want to introduce yourself, this is the place to do it. Personal stories, anecdotes, or just general comments on how you found us and what you hope to get from the site and community are welcome. If you want to explore the community more, I recommend reading the Library, checking recent Curated posts, and seeing if there are any meetups in your area.

The Open Thread sequence is here.