If you grapple under different rule sets how do you know which rule set to use on the "street" cause we all know grapplers are just sport fighters and they have to follow a rule set.
Hardwood floors are at least somewhat street-like.
Back in the wrestling boom-time of the 19th century, it was common for professionals to wrestle, say, 3 rounds, each round being under the rules of a different style - collar-and-elbow, side-hold, Cumberland/Westmorland, etc.
The unintended homogenizing effect of the Olympic Games was a real dampener, though, as many regional folk-styles not selected for Olympic competition found themselves struggling for funding and recognition. Those that had enough grass-roots support struggled through, others faded away and (some) have been subject to more-or-less imaginative revivals.
dont like this sport soo faaakeee