Your saddle should fit both you and your horse, for optimal performance.
And keep in mind that saddles for different disciplines will require you to have different seat sizes because you are doing different things. So I would expect someone to use a different seat size for cutting, or for roping, or whatever, because you are doing different movements for a different purpose.
Maybe the best way I can put it: You don't see one of the world champion barrel racers running in a saddle that's too large. Nor do you see a basketball player wearing a 1/2 shoe size too large. Nor a Tour de France bike rider with the seat too low for their legs.
Doesn't mean it can't be done. But, you should have the proper tack and the proper tools that FIT you.
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.