Toward a "modern" Emacs

> I didn't know about Emacs's dynamic autocompletion using M-/ until I'd been using it for about 10 years

Never heard about it over the last 25 years. I'm using M-, for tags though. Will have a look, thanks.

Discoverability of features is absolutely horrible there. Just enabling popups a-la "did you know" on startup would promote a lot of them. Of course it would require that they are actually usable without having to blindly copy-paste config sections from stackoverflow...