Yeah, but motor size might compete with other things in the limited space. If you get (say) 30L more space from making 4 motors smaller, then that's 30L you can

Yeah, but motor size might compete with other things in the limited space. If you get (say) 30L more space from making 4 motors smaller, then that's 30L you can use for batteries which is (....really bad napkin math...) perhaps around 10kWh? Or 30L more trunk space or cabin space. In a hypercar it's obviously even more cramped, but more importantly a smaller engine is lighter.