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> Why can't arbitrary LSP clients connect directly to tsserver (maintained by MS) ?

As far as I'm informed, they can.

For example, NeoVim language client has a pretty wide range of officially supported servers [0], including tsserver.

It connects to a community maintained lsp server that wraps tsserver https://github.com/neovim/nvim-lspconfig/blob/master/doc/ser...

Is it not possible to connect to tsserver directly? If so, do you have any information why?

TSServer predates lsp iirc

Oh, so TSServer is not an LSP server?

That's why an arbitrary LSP client can't connect to it.