As has been somewhat covered, Corpses used to be lootable. But, it brought a great deal of performance issues with it due to having hundreds of gore blocks laying around each slowly decaying on their own timer, among other things.
And on top of that, the corpses were like 90% empty, 5% useless junk, and 4% things of questionable usefulness and 1% of actual use. So during gameplay you were constantly wasting time for basically nothing, and then on horde night you'd then spend 2 straight days cleaning up the gore piles so the next horde night wouldnt go right over your wall.
So, To alleviate the performance issues, they just made it so corpses despawn quickly, and to make up for it they gave zombies a chance to drop loot bags that loosely matched the drop chances of the old lootable corpses, only now you dont need to wonder if you got loot, or if its any good- Theres a nice chime telling you when you got loot along with a bright flashy yellow bag so it's easily v...
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