That is not true. Check out Royals running tracks or the ones on NCL's newer ships.
It doesn't really matter the size of the running track they just need to have one. DCLs aren't exactly fabulous with the narrow tunnels and families playing shuffleboard. No running track on a ship is going to be perfect, but at least have one. I get exercising is not your thing, but there are enough of us who like running tracks it's an issue. It's been mentioned multiple times on this board as a negative of the Wish