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I've used that type you see on the left there. They're awful and dangerous.
It's better to bring an adapter specifically made for the plug you have and the sockets where you're headed.
When flat They're mostly fine, but those "universal" ones have so little grip in them to cater to all plug types, that when wall mounted, the plug usually is left hanging half-inserted, exposing the live conductors.
Or more likely, the ones you used had been worn.
Universal sockets are the norm in many places now. I have every outlet with universal. They grip stronger than a standard American outlet and have tamper resistance. But like any receptical they wear out and are only good for so many insertions. If you use G type plugs they seemingly last forever.
Nope. Brand new. Several of them.
Also, the US connector doesn't grip very well to begin with.
I mostly use F or E, plus the occasional A.
Why does every hotel ever have those stupid loose plugs? If you sneeze right it'll just fall out.
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.