My major hobby is Cowboy Action Shooting (CAS). The shoot mentioned was the Midwest Regional, a really big deal. The most popular shotgun is a 20" Winchester 97 or a Chinese clone (Norinco). The usual SXS is a Stoger, Bakal or TTN clone of the Colt 1887. The serious SXS shooters use Browning BSS' or SKB's cut to 23" with action jobs that allow the barrels to stay dropped without pushing them down and the auto safety changed to manual. The major reason for the short barrels is to manuever around props like storefronts with windows and doorways. Longer barrels keep getting caught on things (note: it's an action (movement)sport).
There are a bunch of different shooting categories, including several that require hammered SXS's. Also a bunch of black powder categories that require SXS's. Lots of Damascus guns in the latter. These are usually left original.
Apparently the CAS market is large enough to have several companys reintroduce SXS's that have not been made for over a century. I was not a shotgun person, but now have five SXS's and several 97's.
