The last time I dealt with a non-dockerized Node deployment, at work or at home, was in 2013. That this was also the year of Docker's initial release is no coincidence at all.
I think for production it’s a good move, it just doesn’t feel like a sure assumption that the majority of node services are containerized.
Well, the argument is more that the vast majority of Node services should be containerized, because the potentially large benefit of so doing outweighs the relatively small cost. I can't speak to anyone's assumptions, but I can say I'm inclined to support this argument because my professional experience for many years has been that containerization causes far fewer problems than it solves.