IDEs like VSCose are only powerful because they integrate coding tools like LSPs and completion enginea. Those tools are also available on neo/vim or Emacs, so you can be as proficient as you were with VSCode. Hell, even GitHub’s Copilot is available on vim!
And frankly, having started coding on Atom before switching to neovim, I find a keyboard centric, mode-based coding much more efficient than a usual mouse-centric workflow.
It really boils down to personal preference, but I’m eager to find some objective arguments proving that “vim is outdated when it comes to ease of use”, because that’s not what I experienced.
If OP installed GrapheneOS they likely already have adb and USB debugging configured.
That said, as recommended in the FAQ, one should use android-file-transfer, since enabling USB debugging (and using adb) is a security breach