Also IIRC, you could work with folding and chapters very fast in Wordstar. This is also a benefit vs Word, which is WYSIWYG drivel^H^H^H^H^H^H driven.
Emacs/VIM, well... I live and die by Emacs (vim before) but seriously, it's a huge kludge, all of it. I love it to pieces, but it's really a very complex beast. Only bested by Eclipse in beastliness, which is also great for similar reasons Emacs is. You can do anything with both, if you put in a big effort. But it still pays off.
VSCode/Atom, only dabbled with these, they seem like Emacs + shiny to me. I respect shiny, but personally, I don't need it.
Lyx - tried it a bit. I think the problem for me, was that it promised too much. But if there are problems, you still need to know LaTex and I found myself back in Emacs and googling for LaTex error.
Wordstar/Wordtsar - for me those things are for writing books or large documentation. Personally I'd still use Emacs, because I use it for so much else. I'd still FOMO a little bit about the road not taken, but we have to use the time we wisely.
(Also, Wordstar = warm fuzzy thoughts about CP/M machines with amber monochrome monitors.)