I'll need evidence of "Top power at Top Voltage." Since so little capacity is at that part of the curve, It'd make sense to design around (as in avoid, not feature) it rather than use it.
I suspect theres inductance and capacitance enough that even if the motors can't handle the voltage, it can be "clipped" until the pack comes down. (Especially since fmu these are 3phase AC motors, the motor driver is already regulating voltage and current to produce whatever the optimal waveform is)
You don't need to design around it - it is not like you can use top power for 100% of the time in most EVs anyway, and there's no good reason to restrict it such that the vehicle can operate at a limited max power for longer. ICE cars also reach top power only in a given RPM range, so it still is a curve, albeit turbo cars can flatten the curve quite a bit.
Well you can see reports of people drag stripping teslas, and comparing speeds at 100 vs 90 vs 50% charge. Whatever the reason, you do slow down.
Apples to broccoli comparison. Besides what I mentioned being optional (I'm sure it has downsides, probably cost), comparing road legal cars with a supercar is... interesting.
You don't need a Tesla to figure this out, my toy RC monster truck does the same thing.