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Hub motors run at very low speed. Alternators run at 17000rpm. Huge difference.
Just look at the numbers for permanent magnet motor losses. It's not that bad, and you won't be spending a lot of time at high engine speed regardless. 10kW motor has a no load power consumption of 300-400W at maximum speed.
Alternators have field weakening, but they are so inefficiently designed from the start that it's not a big difference. They have inefficient cooling fans, significant rotor power consumption, and 4x the iron losses for the same magnetic field strength.
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