+1
Even if a spawn point has many vehicles burning because puppy campers are popping them like bubble-wrap under the feet of a 5 year old - it makes sense to have it for like 20-30 seconds and then disappear. And if it slows down the framerate, a good incentive for the puppy campers to move along and give your opponent more than 3 seconds before popping their turret.
Most MMO do have wreckage that burn in place after crashing/blowing up for at least 30 seconds so that if you turned around for a second or two and then looked forward again, you know something happened. And as mentioned above, especially when someone augers that you're dog-fighting and you miss it, it at least gives you some feedback they crashed.