As a counter example, email is a federated system too. I don't think a federated network should, or can for that matter, mimic the user friendliness of a closed

As a counter example, email is a federated system too. I don't think a federated network should, or can for that matter, mimic the user friendliness of a closed system; so there won't be massive exodus of users from Twitter to the federverse, no matter how screwed Twitter became.