I used to love XEmacs, but it has been declared dead years ago.
I used it to write papers and several programs. I even used it to write my Ph.D. thesis. I have read and appreciated jwz tirade against GNU Emacs, and I think he’s right.
Anyway, some years ago (I think about 10 years ago) I switched back to GNU Emacs and I’ve never looked back. Still, up until now I have seen XEmacs as a nice project. But now the leader of XEmacs states that he would oppose any improvement to Emacs that “makes it even harder for XEmacs to catch up“. That only means that it is time to stop thinking about XEmacs and go on.