No problem with IP, but it makes the discussion meaningless in an open source forum.
On the other hand, like a collegue told me: All patents about electric motors have been done already. There is nothing really new.
But it is an interesting field anyhow, with many small optimizations.
and many more…
The cooling with low Kv direct drive is a challenge.
If you solve the cooling issue (e.g. by water inside), at least the ohmic losses do not destroy the motor.
The truth is, the lower the RPM, the lower the power, so gearboxes are often used.
So yes, we have a lot of compromizes and you can build a series of custom motors.