I think you me question is missing some key words. “Why isn’t the use of the bidet more widespread in the USA and other western countries?”

I am in Vietnam right now and nearly every bathroom has a bum gun to wash your bits. When I was in Japan nearly every bathroom had bits to wash you built into the toilet seat with digital controls. These are not just in homes and nice places, but also at 7-11, train stations, airports and even hole in the wall places. Wish USA/Canada had this as we all know how much it sucks when out and you have a forever wipe.