Tiny communities where there are only 5 posts a day 1 category and zero chat usage do not really benefit from a sidebar, I can totally see outlier sites turning off enable experimental sidebar hamburger, this will be default on but we will maintain support for disabling
Sites like this don’t really benefit from the hamburger anyway, so the slightly different rendering will not even be noticed
I also hear the objection of “omg new user 10 sections in user menu 3 notifications total”, I can see us adding a heuristic where “tiny amount of notifications, fewer filters”