Because it does. I have pock marks in my ceiling where I have lost my grip on the plug and shot it up. Guess how many times I have done this with the G.I. style plug? ZERO.
The main reason I switched back, is because I often go out with my dad to the desert to piddle around, and I switch my carry gun to .22. I have come very close more than once to searching the sagebrush for it.
And if you say; "just use the wrench", this means A: Another item you have to keep handy, and B: If you have to use a tool to do something you could otherwise do with bare hands, that means it is indeed MORE DIFFICULT.