yeah I'm not a fan of how players basically absorb a cars health as soon as they enter. but if players were able to be shot through car windows, car chases would be impossible.
imagine car drop off missions. some of the locations are pretty difficult, especially if the defending team swapped out to AV weapons.
if you're trying to ninja a car objective, if the other team was constantly able to shoot your tires or you through the windshield, it'd be impossible to make any progress.