Nah, I don't buy it, people have been telling me that they don't understand Twitter, what it is for and so on for years and most of my normal friends never got a Twitter account, while most of them had a Facebook account. It's not about federated vs. non federated, they all have a federated email account from their school, university, work, etc. and everyone has a username@domain.tld address and nobody is complaining about that it's not just @username for email. It's more that it's not useful for them to have a Twitter account or a Mastodon account or a Lemmy account. If it were useful they would just deal with the complexity like they do with the complexity of Facebook and Email.