Let us be able to disable tracks, ruin engines, break windhields, disable vehicle guns etc.
There's currently a "Our vehicles are made of paper!!!!" and "Vehicles are so broken!!" type of faction war.
If we had modular vehicle destruction, I think we could safely change vehicles to be more durable, while at the same time making skillful use of anti vehicle weaponry just as, if not more valuable.
But the most important part: We can stop people from driving off in spawn vehicles
We currently only have rear rotor blades on choppers being modular, and with Oki confirming that the spotter part of tanks will be destructable too. Would love to see that carried out to the other vehicles in greater effect too.