From my recent trip to Norway, I can confirm that most of the information here is still relevant! Monzo has made the experience pretty painless as I hadn’t the need to touch any physical at all. The card worked everywhere ranging from Flytoget (I bought the ticket via the app in the end) to hostels and bars.
Contactless usage is still fairly uncommon, even though the symbol can be seen on a few POS terminals I came across. Perhaps it only takes local Norwegian card at the moment? Chip and PIN worked perfectly though (and if anything, the trip actually helped me remember what my PIN actually is as I’ve been so used to contactless in the UK! )!