Not only do they fall out, they also like to slide out part way, exposing the hot part of the plug while still being hot. In EU and these British ones, once it slides out a bit, it will lose contact before you can touch the metal.
Yeah, both UK and EU ones have the plastic coating on the base of the hot prongs to prevent this from happening. I really wish US plugs had this plastic coating.
I'd choose UK plugs over US plugs any day of the week, but I still think EU plugs are 10x better than UK.
Modern ANZ ones also have the plastic coating as well. It seems to be a more recent introduction though so there are still plenty of non-plastic-coated ones. Is this also the case for the UK/EU ones?
I, at least, try and dispose of any non-plastic-coated plugs though.
You can still find old lamps and stuff that don't have coated prongs, but I don't remember seeing a consumer electronic that's uncoated for at least a decade.