We've seen this already with the integration between the threadiverse (lemmy etc) and mastodon/microblogs.
It basically sucks because the platforms are fundamentally incompatible despite how close the protocol brings them together.
Incompatible platforms don't work together.
Federation and the protocol don't change that. People will just reroute around UI friction and basically ignore whatever federation is offering if its UI sucks. The lively app+frontend development indicates the same.
reiver