> ID cards are also a thing, and in principle every grownup should always be carrying ID although its not like everybody really does when walking around the park etc.

Tangential: I may be misinterpreting what you mean by ”should”, but no one is required by law or regulation to carry identification on them in any Nordic country (except for in certain circumstances, like while operating a vehicle that requires a license).

If the police have a valid reason to ascertain your identity as part of performing their duties, and you refuse to tell them your name, date of birth and address, or they have reason not to believe you, they can detain you until your identity has been confirmed. An id card can save you that hassle.

So if you’re just saying that it’s a good idea to always bring your id with you, then sure.