It's slow and buggy and difficult to wrangle to the needs of modern text editing yea?
Look I live in emacs. I cannot explain to you why this is such a shitty experience. I assume there are random assholes around the world who are holding emacs back so they can view their email from a repl or some bullshit.
Can you be more specific about your complaints? It's open source software. If there are bugs we can fix them and submit a pull request.
I don't think your complaints are a common experience.
I've used neovim for the last 10 years, but before that I used emacs with R for many years at work and it was great, certainly not slow.