It is all driven by application...
Check airplanes, multiple motors are normal practice.
Check this one is good example...
But trust me it is not simple to set it up.
While with sensored motors and controllers you do not need to think how to set it up just bolt on.
And there are benefits of using multiple motors, and mostly related to high power motors. While in under ~2000kW there is no reason (In my opinion, would be happy to discuss otherwise) to use 2 small motors instead of proper-sized one.
With some exceptions:
-space limitations
-price