I'm a little surprised across the responses so far that there's been no mention of the adoption of or migration to a fediverse platform of some prominent creatives or communities.
It's understandable why they haven't given many of the issues already mentioned thus far, but in terms of others jumping in to federated services, among the least technical stumbling blocks by far is probably the absence of those (or those communities) they'd like to continue following (or participating in) here. Some of that may fall under discoverability/onboarding & content or critical mass mentioned, but it still caught my eye that it wasn't specifically mentioned.
I suppose by its lack of specific mention this mightn't be seen as being as much of an issue?