It's not pretty much what SpaceX is doing. Even down to 1 of 9 engines and throttled as far as they can (they can go to about 70%), it has too much thrust to ho

It's not pretty much what SpaceX is doing. Even down to 1 of 9 engines and throttled as far as they can (they can go to about 70%), it has too much thrust to hover. So the amount a single engine can throttle is indeed important. SpaceX plans to solve it by extremely accurate timing so they don't need to hover.