The effect of this (as a not fully formed thought) I suspect is to exacerbate the above. Sub-networks of iso-featured platforms develop. People fracture over multiple accounts across these platforms. Then followers fracture.
The whole *social* side of this becomes a second class citizen at a fediverse level.
The alternative? A protocol + base software that guarantees a "rich"/variable set of formats to establish the feature-set floor and provide "single spaces"?