It's a proof of concept demonstrator
So let's not read too much in to it, frankly we'll done Bell forgetting some real size flight hardware to this stage. I suspect the 4 motor choice is a combination of redundancy, noise, weight, heat dissipation and response reasons. I know other manufacturers are looking at electric tail control but this is the first I have heard using more than 1 rotor, a very elegant solution in my opinion as the motor is likely to be the weak link in the chain reliability wise, cabling, generators and control systems have aircraft qualification already. Would be very interesting to see how it handles in crosswords above the minimum spec point (17kts). BTW what is the normal low speed envelope for the 429?
DM🐀