I don't get the obsession you Brits have against IDs, in Europe you are pretty much the only ones. But a lot of what you say resonates with my observations:
- single point of failure: absolutely, but so is the "sign in with Google" or equivalent. It's just too convenient. I'd rather have a public service do it than a private company that can cut you out at any time without any explanation.
- Nanny State: 100% also in Sweden, actually worse here. But historically they have been pretty good at protecting freedoms, so far. The UK (or Italy) may be less nanny, but have got some very illiberal things going on these days (left or right government doesn't really matter, it seems).
- Happiest people on earth: I really doubt the surveys measure happiness. They tend to measure trust in institutions, which is very high in Scandinavia.
- It's an incredibly authoritarian society although no Dane would ever say that: exactly the same in Sweden! They would NEVER admit any failure in their society, no matter the hard evidence in front of their eyes. I guess that it's the other side of the same trust of the previous point.
- Drink more øl and get off the internet and go for a walk in a forest: At least you've got øl, in Sweden alcohol is taboo. Forests are nice, but become boring quite quickly :)