The Ferrari 296 GTB weighs about 1500kg and the sports version 1300kg. For the cars YASA produces motors for it's much easier to increase the power to weight ratio by reducing weight than increasing power. I imagine an important design point for all of its components is to reduce weight.
Also as mentioned by another comment, Mercedes produces Formula 1 power units, and engineers would kill for a savings of a few kilograms in Formula 1. Those savings are not easy to come by.