Personally, I think there is a nationwide issue with people NOT getting their horse responsive to their seat. In my opinion, there should be no need for whips or spurs if the horse is truly on the aids. And this fault falls on the shoulders of the trainers/instructors.
I’ve seen way too many folks who, to put it simply, are overhorsed. The reason I say this is because at a recent clinic with a past Olympian, 8 of the 9 horses were WBs (most imported). The non-WB was a TB. The clinician essentially had to get on each horse (except for the TB) and resensitize it to the riders seat. Each rider had been working in spurs, which caused the horse to tense even more.
And the most interesting part to me was that the highest trained horses (those at PSG, I2, etc.) were the ones that put up the biggest fight about having to move off the rider’s seat. By fight I mean some pretty serious rearing, bucking, and spinning. The sad part was that it became obvious that the AA riders, good as they were, were too intimidated by their horses to ride through the bucks and rears. The clinician did a wonderful job of staying quiet and keeping calm persistence in asking the horse to “move off my seat NOW.” Sadly, I do wonder how long the AAs will be able to keep their horses “off the seat” after the clinic.