Not just that, to improve the ActivityPub ecosystem as a whole we need to separate servers and clients.
It might have been a good idea when Mastodon just needed to be an alternative to Twitter, but now we can aim higher.
We shouldn't need one account for twitter-style feeds, another for reddit-style forums, another for flickr-style photo sharing and another github-style code work. We can have one single account for everything, and just change the clients.