I know some Mastodon devs are either skeptical of doing it or think it wouldn't be worth the effort but: imagine if Mastodon spoke ActivityPub's C2S protocol on both frontend and backend and then you hooked Mastodon's default web frontend to @puckipedia's Twitter AP bridge
Then you could control twitter through something that looks like tweetdeck but using mastodon's UI
that shit would be hilarious