I’ve heard that this was done for a military purpose, as was the abandonment of the helicopter during bin Laden’s capture. Knowing that we already have something 10x better, we leave our previous generation of technology out in plain sight to signal the enemy about how far ahead of them we are. They waste time and resources replicating what we already have while we stay a generation or two ahead of them.
Israel must have some very advanced weapons, too. The before and after pictures of the Iranian military base show something awesome happened there.