[natrys]

LSP I can probably understand, mostly for performance reasons. Native json parsing and native compilation goes a long way, but clients written in elisp seems susceptible to edge cases where it's not performant enough because UI and IO runs in same thread in Emacs. Not insurmountable even without multithreading, some newer clients that uses better IPC or the dynamic module system are not constrained by Elisp requirement and seems to be doing fine in terms of performance.

The dynamic module system is generally a win for pragmatism over ideology, and it has been around for 7 years already. You can't do everything, like say extending core graphics of Emacs, but you can do a lot in any language of your choice if you feel constrained by Elisp. Tree-Sitter feature is built on top of that so it's not clear to me why do you think Emacs can't do better than say neovim. I use neovim and tree-sitter daily and generally don't think tree-sitter itself is rock solid yet, I run into indentation and slow query issues semi-routinely. But I am much more impressed with the work happening on Emacs community that leverages tree-sitter for advanced tooling [1].

[1] https://github.com/mickeynp/combobulate