It's unfortunate that some VS Code extensions, e.g. remote development extensions, can't be used in Onivim 2 due to license restrictions[1]. [1]: https://github.com/VSCodium/vscodium/issues/196#issuecomment...
Can any VS Code extensions be used in Onivim 2? Despite appearances, Onivim isn't a VS Code fork, it doesn't use Electron, and it's not written in Javascript-- it just happens to take substantial inspiration from VS Code's UI.
Yes, this is basically the entire point of Onivim (use vscode extensions with vim). https://open-vsx.org/