From what I’ve seen, most people who are serious about shooting skeet and trap don’t shoot anything with a barrel length less than 28”. Not that you can’t but it’s less common.
I used to shoot trap pretty regularly at the Renton Fish & Game Club. There was frequently a guy there that shot with a 12ga tactical pump shotgun with an 18.5" cylinder bore. He did reasonably well with it somehow. The constant ridicule from other members seemed to roll right off his back.