>Most toilet innovations have had little success
You see more and more toilets witch have 2 buttons
one for flushing small erins and one for big erins. Another successfull innovation is the toilet that is attached to the wall instead of the floor for easy cleaning.

Also the plumbing had greatly improved to prevent blockage (PVC instead of iron) Removing blockages has also become highttec, they even use cameras !

>Turkey, Japan
It is true that toilets are a part of culture. In Islamic cultures the use of water is prefered to water. (As far as I know that is not compulsary by that religion, but the religion tends to emphasize a lot on being clean) In absence of a bidet you often see a kettle or flower watering can in toilets of people who are used to using water.

I once read that the advantage of water over paper is that you can get small wounds from rubbing with paper (sanding) that tend to infect in tropical countries.

>squatting
Not everybody is able to squat in a comfortable and balanced way (e.g. with their feet flat on the ground and their behind just above the ground). I actually have been training this for a few weeks with little success, I only ripped my jeans. This also seems part of ones culture, asians and africans seem to be beter at this than western people. Maybe because they are not used to/can't afford proper seats. (I also wondered if it has something todo with the exersize they get on the toilet)

>lean back very far
A toilet which allows you to comfortably lean back would be a great improvement. I once ate something wrong and head to go to the toilet every 5 minutes, and I could not go to sleep because of that. Other people have the opposite problem, it won't come out. Would be nice if they could lean back read the paper, drink some coffee smoke a sigarette.

I am very interessed in the kind of water that is used for flushing the toilet. It amazes me that it is still very common that the same super clean water is used everywhere in the house. Where I live the water is so clean you can drink it out of the tap without getting sick and it doesn't even taste bad.