Maybe for some users. I'm sparing with extensions because I find them hard to vet; I checked and I'm only using clangd and prettier right now. But I don't think Electron is required in order to have rich extensions - just see Vim/Neovim, Emacs, or any IDE.
> Sublime has LSP since a while now.
My bad then. I thought sublime's LSP support came from a third party package.