Somewhat paradoxically, it's actually safer from a consumer safety perspective to assume that you don't have a polarized connector. The big reason is that the consumer can see fit to make modifications to meet their circumstances.

If the culture here in the US of filing down the wider blade on polarized plugs so they'll mate with an unpolarized receptacle is anything to go by, people just want to use their stuff, safety be damned.

Oh you funny man, thinking we have polarized ones!

Brits do I think, but most of the eu has unpolarized ones.

One of the common 2 socket wall sockets for example have just straight bars connecting 2 sockets being 180 degrees rotated, so each socket have line and neutral on different connector.

So if you say put a tester in it, one socket will read "correct" while other will read "L/N reversed"

Saves a lot of space too. One thing that’s bothered me with most popular socket variants is how wide their power strips usually become.

I think the Italian one is the most practical variant that unfortunately isn’t as ubiquitous. It (1) occupies less space, (2) reversible, (3) sticks to the wall more firmly unlike the flat-pronged ones in North America.