And there is no way EVs need less space for battery + motors in total. Have you seen the size of a Model X battery pack? Only difference is they typically use space below the floor of the car, rather than in front. They are typically a bit wider than ICE cars to compensate and give sufficient interior space.
You will have to, and you say "The size of the car is in no way constrained by the engine size," which is a complete nonsense. On the lower end, it's constrained by sellability of a car, and on the upper end it's physically constrained by the size of car frame.
> Only difference is they typically use space below the floor of the car, rather than in front.
Yes, and that's a very big advantage. Even very tiny EVs can have batteries with hundreds of kilowatts of power output.
Yes, as already said, I completely agree.
> and on the upper end it's physically constrained by the size of car frame
In theory yes, but in practice you don't really feel this limitation, that's my point. As I said, you can fit a K24 engine into a Honda Fit (B-segment supermini car) without modifying the frame or bodywork. A turbocharged K24 can put out 300 kilowatts without breaking a sweat.
Using bigger engines, for bigger cars really makes sense.