All joking aside, it's a serious question, esp in a house where people have health challenges already.
For many people with health challenges, the height above the floor is a more important difference than the shape. The most common "home fixtures" in the US are "low-boy" designs (because it's stylish?). For some reason the "tallest" to be found in most retail shops is called a "standard height;" but it is a little over 2 inches taller than the more "fashonable" ones and even that makes a lot of difference for the "motion inhibited" user.
The true "handicapped" design, meeting specifications of the ADA (Americans with Disabilities Act), appears to be a "theoretical concept" not actually available anywhere I've been able to find - even on "special order."
I've swapped fixtures in two houses thus far with much success, but the "porta-poo" in the camper remains sort of a special problem. (I've considered a ceiling hook and a cable winch for getting her off the pot; but the roof would have to be reinforced, and she's objected to that.)