If you hung a stretch of track up at a firing range, unloaded 6x or 8x 50cal at it nonstop, don't you think it would eventually fail? Due to whatever weaknesses, inherrent or accidental, the more you shoot at it, the greater the chance of destroying it. What you complain about is the same as with airplane wings in-game. You may not see every last consequence of the damage, but it is there.