I just don't see how it's funamentally different from ostatus.  The problems it has are the same as ostatus has.  The features it adds aren't of interest to me except the privacy features, but I don't think they're implemented in a way which adds real privacy, and basically I am going to be the bitch that stubbornly refuses to implement something at all if it doesn't offer real privacy, because people are GOING to get burnt if it's not real privacy.  Right now it is trivially easy to do SIGINT on Mastodon's implementation of private messages for instance, and you have a lot of activists on that platform.  It is deeply socially unresponsible to offer security that isn't going to be up to the level of threat.