Realistically, platforms on the fedi are much closer in design to their commercial conterparts than one would hope for if your goal was community building and situating the process of digital/online community building within the community themselves.

It's still relatively early days yet. A lot of Fediverse services mimic commercial ones because it makes it an easier pitch to people "it's like that but open and privacy-respecting". Hopefully, as they mature they'll evolve away from this. In addition, now more people are comfortable with the Fediverse they'll start to create new and unique platforms.