Then you're buying shit.

I use universal with everything and they grip way stronger than default US outlets. Just a fact. Never have a plug hanging out. Works with grounded and ungrounded. I even replaced every outlet in a few of my US houses with universal, they are that awesome. No issues for many years, at least 15 now, with various inputs including well used ones in a kitchen for example with appliances being plugged and unplugged all the time.

Literally the only thing I like a US plug and socket for, are extension cords. The 5-15 is a great option for a long run. Don't need a book sized receptacle on one end or a giant cylindrical twisty lock to power a 20W load somewhere.