Earlier quoted context omitted.
I can imagine the answer if I were in their shoes. Say I already have something working as a plugin (or know how to make plugins vs. learning from scratch about implementing LSP), I'd rather have this out there as soon as possible and add more tooling/language support in subsequent releases.
If it was just one I would have assumed the same, but Intellij, VSCode, and Neovim..?
"We are also releasing two other plugins: our VS Code plugin, and our neovim plugin. Today, these plugins only provide basic editing features like syntax highlighting and code folding."