I don’t disagree that it’s a weakness. But that just is how it is for now. I’d guess that it will settle down to a few dozen “strong” instances that are all federated together, with hundreds more smaller instances available, but right now there are like 5 super-packed instances (lemmy.world, sh.itjust.works, knob.social, etc) which are getting killed with a double-whammy: all the users and all the communities are on them.