I see no distinction between adjusting static timing in the esc or motor. The end result is the same - the absolute kv of the motor increases, and efficiency goes down. I presume some torque is lost, but the differences would be no more than gearing up or down a bit - as in gearing, the effect is constant throughout the rpm range. It's only really a problem in classes with restricted gearing options, like Minis. Dynamic timing is a whole other matter, giving mod performance with a stock motor, and puts a premium on escs and their firmware - an arms race, as there is in touring cars.
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