I agree with you on the point that a trick isn't unnatural if you can only do it one direction, after all, like many people, I spin right forward and left switch because I'm more comfortable looking over my left shoulder and opening my hips that way.
Same with rodeos, lincoln loops, and other off axis tricks, sometimes people who spin left upright, prefer right rodeos and vice versa. Some people spin one way onto rails and then spin the opposite on jumps and on and on. Because of that, it does sort of obscure the concept of "natural".
I disagree with you on the natural right spinner doing an entire left run and then trying to take something away from them. Paul Rodriguez is a natural goofy rider. He also happens to be unusually and supremely ambidextrous as a skater. He regularly does contest runs entirely regular, and is rewarded handsomely and should be. He established himself as a goofy skater, and then pushed his switch game to the top. I know these sports aren't identical, but I, were I a judge, would absolutely reward an entirely unnatural run. I think in the scoring of slope, there's specific judging criteria that calls for spinning all directions, so maybe not a great parallel, but it is 100% correct to reward unnatural spins.
Variety and diversity in trick selection is and should be rewarded in slope, but all things equal, unnaty tricks should definitely be scored higher.
