> LSP (Language Server Protocol) was the final nail in the coffin of Emacs for me.
It was the opposite for me. Emacs + LSP + many other common conveniences all bind together so beautifully and efficiently that I can't imagine using any other IDE at this point.
Indeed. I'm a long time Emacs user (emacs-nox in the terminal). After spending a day getting LSP and eglot working, I'm loving the "IDE" experience. Reliable indentation, auto-complete, intelligent var renaming, real-time(ish) warnings and error messages, etc, all the good stuff. I'd been ignoring IDE features in Emacs for years, thinking I didn't need them, but I have to admit they're a luxury I don't want to give up.
And I have to say that the whole trope of "Emacs may be able to do anything but you have to configure a lot to get it to work" has has got to be pure exaggeration at this point with things like eglot. I had the most painless experience setting up LSP for Java (among many others).
Getting everything set up for jump to definition and find references to work with an existing code base ... can be a journey.
If you are at a Visual Studio / XCode shop (where these things have been set up and work) you will definitely be swimming against the stream trying to get emacs to "speak" that codebase.
Same, Emacs is improving at a rapid rate thanks to its adoption of LSP and Tree-Sitter. Performance is very good, but the async story needs to become better.
It was the opposite for me. Emacs + LSP + many other common conveniences all bind together so beautifully and efficiently that I can't imagine using any other IDE at this point.