Joop
Wall of Flesh
I don't have much to say here because it's quite simple. I dunno if this has been suggested before either but I haven't seen anything like it. But anyway, I simply suggest that bosses in normal mode drop Treasure Bags. Of course, it would exclude their Expert Mode exclusive items. But this would make it so much more convenient. It wouldn't clog up your inventory, especially when farming, and in multiplayer everyone gets their own bag of loot, like in Expert mode. That's pretty much it.