Damage done by explosions to vehicles is undetectable. You could just shoot RPGs at people's vehicles and blow them up without consequence or credit. It's the same reason we don't have Hydras and Hunters.
Surely that can't be the reason why this gets rejected... I mean there are plenty of stuff that's undetectable, like grenades themselves which are in the game already, the list goes on
I don't know how BAD this can affect whatever it can, but it will be fun for sure and I believe that's why many are supporting it