>Why does it matter if they join each channel?

Higher friction to visit other channels means that it will mean less people will visit other channels. I've been in a Nix / NixOS room for a while and I had no clue I was in a space and that space had other rooms until you commented that it existed. I never had this issue with discord. It was obvious there were other channels the first time I used it.

> I've been in a Nix / NixOS room for a while and I had no clue I was in a space and that space had other rooms until you commented that it existed.

sounds like a temporary issue though: first only rooms existed, now Spaces exist, but the room directory still exposes rooms instead of Spaces