They are not. You step up over the sill to get into an SUV, then your feet go down into the footwell. Your eyes end up slightly lower than a person standing (and much lower in a sedan), while a motorcycle is very close to exactly standing (they have to be able to put their feet down when stopped).
I see other people saying the same thing, but it totally defies my intuition.
Isn't the seat in an SUV objectively much higher up than the seat of a bike? Aren't your feet much higher on the floor of an SUV, than on a bike?
What am I missing here?