One day it may occur to saddle makers that they need to have changable padding for the bars (panels) that tilt the seat incrementally from a raised front and lowered back (pommel to cantle) and of course in the reverse direction.
Few horses are exactly the same level end to end along the area the saddle sits.
Additionally, and likely even more importantly, they will discover that rather than a single short "bar," hanger for the stirrup leathers, there should be a long bar with separate notches, one after the other, along the bar to move the stirrup leather along to position the stirrup from forward to midline to rear, possibly five positions.
It's so simple, and the materials needed to do it, super strong, light metals such as titanium, and fabrics such as kevlar or carbon fiber filled stranding for strength and wear, are now "off the shelf," items. The technology to handle the materials for fabrication of course also exist so any custom configuration a saddle maker wished to order up for his or her line of saddle products would be available.
I own, for instance, a few pieces of rope line, only one quarter inch in diameter, a composite of various exotic fibers, that will hold up to 16,000 lbs. No, that's not a typo.
It's used now for, among other things, rigging in set construction for movie and video productions. A rigger is my neighbor and gets it as discards. I won't use it with horses for the simple reason it is too thin and too strong, but one can get it in strap form for things such as saddle components of one wished to.
And no, I'm not inclined to become a saddle maker, but if I knew one close to me I'd be happy to work on development. I did once in the distant past on cutting and reining horse saddles and see near copies today, 40 years later, to my design then. No one, up to that time, had ever seen a level seat on a western saddle, nor a "pocket," (lowest point of the seat) centered between pommel and cantle so the rider sat forward a bit off the cantle. No one had seen knee rolls, "blocks," under jockeys on a western saddle either, but I had them installed.
That neither I nor the saddle maker patented those features has been of much regret to me.
They are everywhere today in these saddles.
I trained many a green horse under that first prototype saddle. Now I consider it old fashioned. But the reining horse world seems to like it well enough, some of them at any rate.
The saddlers, especially today when going to "treeless," or very flexible types are trying so hard and must needs be even more creative.
Think about that stirrup bar that has four or five positions along it's horizontal plane, and a saddle that can be, and lock incrementally in many positions, made to rise in front, drop in the rear, or drop in front rise in the rear and how much it would benefit not just the horse, but the rider as well and the greater number of horses it would fit...almost any horse for that matter.
The CAIR system, for instance, needs to be expanded upon, conceptually, to other parts of the saddle for other effects. It is, of course, meant to be part of a rigid tree system if I understand it correctly. Why not a treeless or very flexible tree?
Lots more experimentation is in order.