Ability to handle email coming soon.
Every text editor, if it survives long enough, will end up implementing a partial, bug-ridden version of Emacs.
Every text editor, including Emacs [...].
Altough now I'm using 9front, Sam and Acme. I feel myself weird not using the keyboard but at least I understood structural expressions for Sam/Acme really fast, first with 'Vis' and next under Acme. Oh, Acme can do mail and news and a bunch more... because it has I/O since the beginning, you can plug anything into it, from commands to the text buffer to sockets. Even a crude HN client if you dare.