The same problem that a hybrid architecture solves for ships: the ability to use physically small electric motors with very high power density that are mechanically decoupled from the rest of the vehicle. This lets a bunch of designs pull off neat thrust vectoring tricky with much simpler and lighter components than a mechanical thrust vectoring system would need.

(Electric azimuth thrusters are becoming common in large ships for roughly this reason, too.)

> ships

That's a tangent from most sensitive vehicle to weight to the _least_ sensitive one.