I have been wondering this question ever since I got my electric scooter (Volta 401) and I plan to upgrade it’s motor to 3000w from the original 1500w version. And since the wheel had the same configuration on the front and back I don’t see the reason to put another motor in the back and put the old one in the front. I put my ideas based on dual motor configuration for e bike where each motor have it’s own controller and connected on 1 throttle. Is there a reason why this might not work?
Ever leave your truck in 4 wheel drive and try to turn a corner? You can get some odd handling characteristics.
That said, I’d take a 2wd mountain bike for trail use in a heartbeat. Although 2 motors is a weight penalty. The off road e-bike market has been shifting from high powered heavy bikes to mid powered lighter weight bikes.