It seems like you tried used copilot did you? To me the best thing about it is not the full function generation, which doesn't work very reliably, it's to finish the end of the line, when you already know what you will type, and it just types it for you faster. It feels like magic and checking the code is extrême fast as it's just one line, much faster than writing it.
So it’s "just" providing the vim advantage to typing speed? As a vim user myself, I’d like to point to the tired argument that typing takes up the least amount of time yadda yadda
