You guys use your 69 cent receptacles from china and mexico, where the plug barely holds and hangs down exposing the hot blades, waiting for that aluminum foil or butter knife from your kid to experiment with. I'll go for something that GRIPS a plug.
You still do not need to install a 20 amp T-slot device to accomplish the same thing. You can just install a better grade of device. Given enough usage even the more expensive device will still lose grip and need to be replaced. Even the 69 cent devices meet the required grip retention standard set by UL.