FWIW there are a lot of features that are really great on a run, but you might have to switch screens or even manipulate the screen. For instance, zoom in and out on a map. Or instruct your watch to re-route you to the fastest way home, or start guiding you the reverse way you came so you end up doubling your distance when you get back home. You might have other sensors feeding info and the data doesn't all fit on one screen. Maybe you want to control music playback and find playlists subpar (you might want to change based on how you feel in the moment, or pick another podcast because you added time onto your run or the other one ended up being boring, etc.).

Play music and run is fine for lots of people, though, so I'm not surprised it works for you.