Do not compare flying a plane with creing a tank that, hopefully, stay on the ground and travels at 0-35mph.
The crew experience , coordination and gunner aim calculation hitting a moving target at the same 0 -35mph affects the hit %, and concealing it minimize your getting hit.
A trained tank crew staye in the steel interior for days/months, sometimes doing pretty much everything inside it.
I recently read the "M4 death traps" , in late 1944 they seem to frequently man the tanks with infantry personnel from the reserve, had shot 3 rounds of AP ammo, and went into combat with men 3 inside the normally 5 crewed tank.
