I now live in the Seattle suburbs, Redmond — very close to the same distance from the work site as in Copenhagen — and there is no way I could realistically rely on public transit to hit appointments unless I left an hour or two early—and, in bad weather, many hours early. I can’t imagine doing what I do without a car.
Last time I was down in Seattle though, I noticed they were building a massive elevated (40 mile?) train thing quite far north, which looks somewhat impressive if it wraps up in the near future.
When I visit Seattle I only use public transit or walk to get around. I use the light rail as much as possible, but it only gets you kind of the way to anywhere. Plan on an up to quarter mile walk to a bus stop and then probably an additional bus to actual get to where you want to go. The previous poster is right in that you need to add at least an hour to your transit time to account for waiting for connections.
Also, a large portion of 1 Line's southern section is at-grade with auto traffic.
I’ve done long commutes and I’ve lived close enough to walk to work. If I and millions of other people had prioritized car free lives 20 years ago we would already had noticeably different infrastructure. Instead I’m back to “needing” a car to get around based on these kinds of choices.