Sensored motors usually have a similar construction (I think it is to comply with governing bodies rules) so 2 motors with the same number of turns will give similar performance. I also think that rating in turns was first started to make things easier for people who "grew up" on brushed motors.
Sensorless motor, however, are usually built with differenet construction techniques such as slotted/slotless, delta wind and wye wind and different rotor diameters. That means that motors with same number of turns can have very different performance, make rating by turns pretty useless.
Avner.
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