I'll play devils advocate on this whole, "lower is better" theory when taking a dump. I lived with the lousy, too low builder grade toilets my home came with for almost 15 years, and I hated them. The new one's I replaced them with are much higher, and far more comfortable. And neither I or my wife, (we are both tall people), have any issues going on them. It's not necessary to take a dump with your knees up to your chin. It you find it is, you need to get your lower G.I. examined by a Gastro Intestinal Specialist. Or else starting eating more fiber.
And you shouldn't have to attend yoga classes to properly take a dump. Another thing that's a PITA are round bowls. Why anyone would choose them over a nice elongated bowl is beyond me. I could possibly understand why someone would select a round model for a planter in front of their doublewide. But not to take a dump on, and be forced to push your equipment through the front, because there's no room. Might be OK for women however.
All this reminds me of a Vietnamese guy I used to work with. We would always find his footprints on the toilet seat after he went in to pee. We confronted him about it, and he told us he could pee better. He said he did the same thing at home, and his wife was always complaining about it. He never explained how having the extra altitude helped the process. Some people can over complicate anything.