> That counts against you because now you have even fewer keys to work with to add copy/paste, shouldn't that extra physical key be instead used for those extra useful letters?

Those are not extra physical keys. Some buttons on the left of ENTER has the Å Ä Ö, that's all.

I'm currently on a Swedish TKL keyboard.

See https://typingdonewell.com/blog/what-is-a-nordic-layout-the-...