I know that tildes is still a small community (sub 9k) but I find the number of groups too restrictive. I am mainly a redditor so I am used to subscribing to many subs, most of which are not "main" subs.
For example, shouldn't there be a group for "countries", so one could post in countries.germany or countries.finland in the future? Also, how come there is no videos? I can understand the reasoning that a video is (almost) always about a given subject but where should I post, for example, a video of "ASMR"? Should it go to health? Should chess posts go to "games" or "sports"?
I find this idea of groups a bit too comfusing, perhaps because I am used to subreddits..
Maybe it is not a bad idea to create some kind of map, with an handy link in the site, so one knows in which group one should post a certain something.