As an anecdote, an online comment responding to someone asking if their choice of server matters (e.g. if their Mastodon account would be visible to someone using another server) was roughly "no, as long as your servers federate with each other."

I would be able to parse that, but it seems rather out-of-touch for trying to attract the bulk of Twitter users. Meanwhile, Bluesky offers a de facto server with some (lesser?) amount of decentralization that's largely invisible to end users.