Tooting my own horn, Emacs’ csharp-mode[1] is undergoing a rewrite to be 100% based on tree-sitter rather than regexps.
The new code runs way faster and is so much nicer to work with.
Once all the kinks are gone, I can’t imagine going back.
[1] https://github.com/emacs-csharp/csharp-mode/blob/master/csha...