> It'd generally be terminals that are most painful to use, and the terminal would be nearly trivial since they keep an buffer of the text anyway and so can trivially recreate the view once they succeed in reopening the window

The cheap version of this is just using tmux/screen, but yeah honestly I suspect a lot of programs are easy to make recreate their GUI state if you care to bother, it's just that not everyone does (or should; it's a trade off and display servers aren't usually that crashy).