Tree sitter support is half baked in the same way official LSP support is, only kind of worse.

Eglot won't help you get your system ready for LSP work, it will only avail itself if what's there. It doesn't even auto detect and configure that, either. There's no user prompting, so you'll have to read the docs to know that this even needs to be done.

Similarly, tree sitter support doesn't include the grammars! And those aren't typically sitting in your package repository, so users have to find a grammar and compile it themselves. There's not even a good recommendation given by Emacs on where to get them, leaving users to hope that whatever repository showed up on a Google search is both in good working order and safe to use.

It's really quite a failure on Emacs.