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All IMHO of course, but...
The size of the motor isn't the only consideration. Using what I learned about a single-speed 10Krpm motor as an example; the stress on the system at low speeds is in the power circuits. It must deliver 1+ Coulombs at times. This means cooling on the inverter as well as (maybe more than) the motor and big, fat cables.
On the low end of rpm you are stressing drivetrain components that are used to forces applied in milliseconds being stressed in microseconds. Like clutches. On the high end top speed is limited by the back EMF. The FOC software needs to be tuned.
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