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The main reason of existance is if you need to take samples of your defecation because of sickness reasons or to check for blood (dark/black shit) it is way easier to take the sample. It sounds gross but if you're every having problems with your intestines and need to go this way, keep them in mind.
I thought they were more widely used in The Netherlands. They are pretty common here.
More likely the design is to use less water.
I never thought about taking samples.
But you don't splash your butt with dirty water when taking a huge dump!