Years ago I lived in a complex with a pretty nice rec center. The pool was a 50 meter regulation, but for half the year there was a deck the came down in the middle making two pool of, I think 25 years. I much preferred the 25 yard lanes because then there were fewer people in the lanes and the 50 meters was just too long for me.
So bigger isn’t always better, and not everyone is going to the Olympics. Some people are just working out.