I ride bareback much more than I ride in any saddle and I live surrounded by wilderness so I know how to duck tree branches! I don't care how you ride for recreation, to enjoy yourself. I am curious and trying to learn what I am missing from people serious and competitive in the sport of reining. I am not trying to put it down! I am explaining the way I was taught and asking why reiners do it differently. Why are you responding to my question if you are not even a reiner? OBVIOUSLY you do not know WHY you ride the way you do. It's "just because".
My daughter was a barrel racer and she rode in a balanced seat - so you do not need to sit in a chair seat. When she was young in 4H she was grand champion having been trained in the "idiotic" classical position which is exactly what judges look for in western equitation. She also excelled in trail classes. She even trained her own horse.
As far as stiffness goes I had my back broken by my warmblood. When I got him he bolted into every canter transition and often blew up from undiagnosed cramping caused by a metabolic condition. He was given to me - for obvious reasons. I had to ride this out myself because every cowboy trainer in the county was terrified of him. I had to learn a SECURE position or I would have been killed - literally. That is why I am saying this works. That is why I am very reluctant to change what has saved my life.
I also had an Arabian that did spin and bolt shies at molecules. Years ago, I took lessons from an instructor who forced me into a forked position that sent me flying up on the Arab's neck. Then I migrated to the "chair seat" which did not improve my security at all. It was one of Sally Swift's students that gave me the feedback I needed to really make my position secure.
After many years of working on this balanced position, I could ride out just about anything. I am not a young person, not even middle aged. But I could ride out the bucking fits of a 17 hand warmblood, although I don't want to do it ever again! I even rode him bareback for 6 months waiting for a saddle to be made. Warmblood gaits have so much more suspension it is like being launched to the moon every stride. It took years to develop the ability to ride him well. The cowboys bounced literally a foot out of the saddle just trying to sit the trot. When I first got the horse, one of them was bucked so hard his feet were jammed into the stirrups. This was a trainer featured in Western Horseman. He admitted he didn't have a clue how to ride him. He was/is a very nice and honest person.
I will quit and end this thread. I just want you to know there is another world out there and it is not full of arrogant people who are trying to put your way of riding down. Your opportunity to know about something a little different and maybe learn something that might help you is now closed. The door you slammed is locked from the other side.