It's also a smaller number of cruisers who enjoy speciality coffee drinks and yet there are like 10 places to get espressos on the Wish. (I happen to like both running and specialty coffee so I was disappointed in the former and happy with the latter.)
Just out of curiosity, have you been on deck 4 early in the morning on a sea day? I think you would actually be quite surprised. It has never looked like a "small minority" to me.
On my cruise last month someone organized an unofficial 5k on deck 4 on a sea day. Ultimately she had to cap it as she had literally (and I'm using the actual definition of the word here, not just figurative) HUNDREDS of people interested in it. So when you've got hundreds of people that want to run on deck 4 on a cruise out of about 3000 people, that's not what I would consider a "small minority." Yes, I know that's for an (semi) organized event, but over the course of the cruise, I would hazard to say that hundreds of people take a full-lap stroll, jog, or run around deck 4. Again, I don't think that's a "small minority."