Another major obstacle is the limited scope of a lot of these projects. Each project, excepts the microblogs, focus on a single media type and ignore others. So you still have to have multiple semi-siloed accounts to participate with various parts of the fediverse. As a pixelfed user, you can't interact with plume/write.as users or vice-versa. It's cool that I can follow all of these users from my Pleroma (or microblog.pub/mastodon) account, but they can't interact with me. It's only one way interaction.