And, meanwhile, I want to have a physical card/printout I can use if something goes wrong with phone/watch.

Don't get me wrong, I do appreciate the apps on my electronic devices but I also carry paper copies whenever I can because electronic stuff breaks in various ways.

Me too, I wouldn't only rely on electronic devices for something as essential as paying. I still carry my cards in my physical wallet with me, it's just that I haven't had the need to use them in a very long time.