This has not been my experience. For example I use this python language server, which is implemented in Python and uses jedi: https://github.com/python-lsp/pyt

This has not been my experience. For example I use this python language server, which is implemented in Python and uses jedi: https://github.com/python-lsp/python-lsp-server https://github.com/python-lsp/python-lsp-server Rust analyzer is written in Rust, gopls in Go, clangd in C++, R language server in R, Jsonnet language server in Go, sqls in Go.