There's a public park across from my parent's place in Taipei. The public restroom there has both squatting and sitting type toilets, and a little sign on the door indicates the type.
There's a lot of arguments for and against squatting type loo's. It's cleaner and healthier, but not friendly for elderly or handicapped folks. Most public toilets in China are squat type, versus Taipei has mostly sitting type.
My complaints about the typical Chinese toilet design:
1) Squatting type toilet is difficult to use by elderly and handicapped. Most foreign visitors are also unfamiliar with it. For public restrooms in tourist areas, they should feature more sitting type toilets.
2) Many of the toilet stalls are on raised/elevated flooring, which makes it very difficult for handicapped folks to use with their wheelchair. I see elevators being installed at some overpass, but making toilets more easily accessible seems low-priority.
3) The toilet stalls are too small for handicapped folks, and lacks support bar on the side for handicapped and elderly. In the west, at least 1 toilet stall would be extra wide for wheelchair users, and have hand-bars on the side for the elderly.
If you had to take your grandfather to the restroom, you'd understand what I mean. China will have great many elderly folks in the future and public facilities must be upgraded to accommodate their needs.
4) The ventilation system is terrible, even in foreign-owned hyper-marts. In restrooms with a window and fan, most of the fans were not running. So we're good at building things but sucks at maintaining them. It doesn't take a genius to understand the need for good ventilation in the restroom to avoid odor buildup.
Also, if you're worried about people not flushing, you can install toilets with auto flush sensors.
5) Why are we still installing undersized toilet pluming that necessities the user to discard used toilet paper in a waste basket, instead of flushing it down?
6) If you're not providing free toilet paper, fine, but every public restroom should have toilet paper vending machine.
Now, I realize the great expense in upgrading the many public toilets to "western standards", but my point is that in areas with very heavy tourist traffic, you should at least afford upgrading toilets there. I saw the Forbidden Palace and Wangfujing get a face-lift last year, but why is the toilets in the Forbidden Palace still portable potties? There's something wrong with the priorities here when a fresh coat of paint over brick walls is more important than upgrading the loo.