Power usage isn't an issue. 10 kW is 13 HP. The size, price, and fragility of the components is the issue.

Steady 10KW load means 40 less miles after an hour of driving if your EV gets 4mi/kwh. That kind of draw would use up nearly 1/6th of my EV's battery in an hour.

GPUs/XPUs are small and solid state so it’s only really price that’s a huge liking factor.

And the disinclination of these companies to push the weights of their cutting edge models into people’s cars where they can be dumped.