Not sure why recent experience is a little different than others
In my case it was not an issue or would affect negatively less than 1% of visitors to Norway.
To recap I had to go in and sign at gas stations when an attendant was not at the pump to complete the transaction by signing a receipt while other European CC holders did not need to do that as they entered a pin on the machine instead.
My experience with this is identical in other countries in Europe as well where in Italy for example I remember during lunch hours having to use Cash as my credit cards were declined ; gas pump automated machine open but no human around and inside closed for lunch. Fortunately those machines accepted cash ; the ones in Norway probably do as well. The Italian pumps no change by the machine is given if paying in cash.
Similarly at restaurants I never had issues ; but did have to sign where other diners with European cards would enter a pin instead of signing.
My other time was a Berry Stand and the owner mentioned to me her bank/credit card processer offers her the option of signature but charges her extra so she declined to pay for that since she sells more to locals and other Europeans. In my case I was not able to enter a pin and the transactions where declined. This was a very small transaction and a was on a side street farmstand in Valdall so likely not on the usual visitor route.
As a whole it is not an issue and I found Norway to be as close to a cashless society / country as one will find. Credit type purchases even for small amounts is the norm ; much more so than in the US
The cards I have since I am a little confused I guess compared to others experience are cards usually recommended as some of the best travel cards issued by US banks. Both have chips and are fairly newly issued.
Chase Sapphire Reserve (which I am 90% sure I assigned a pin to ; as stated by others the bank will tell you to assign a pin for cash advances)
Charles Schwab Visa for my Debit card (which has a pin of course since it is a debit card)
In the case of the Berry Stand I tried these 2 cards as well as a credit card my wife carries in her name ; a Chase Sapphire Preferred (I have no clue if we assigned a pin ever to that)
I was of the opinion that my cards are all of the •Chip and Pin with Signature Priority type that Paul described in his helpful post. I was not aware any US banks where issuing Chip and Pin with Pin Priority ; which is how all of the European cards are but guess some are now offering that though rare.