I find this sound kinda annoying and misplaced. why is that even there?
there are no other cockpit-to-ground communications played, like "parking brake set" etc.... so it'S very strange to have this particular one in there.
The sound is not misplaced, and it's played at the correct time. We might add *other* cockpit to ground sound in the future, surely not remove that one.
furthermore, it does not watch the engines, I pushed back with only one running and he still said it was a good engine start...
It's entirely correct it will say that with just one engine running, because the whole point of that question is that, before disconnecting the tug, the pushback crew wants to be sure you'll be able to go back to the gate if you have a problem, which becomes an airport problem if they have an airplane stuck on a taxiway with both engines dead which might require to be towed back to the gate to fix the problem.
With at least one engine running, you can go back to the gate on your own so, even if GSX doesn't have a pull function now, it will have one in the future, so if your engines are both dead, it would then ask you to be pulled back to the gate.