>>509221625The bucket is because this developed in a country without running water. They use a small cup of their hand to splash the water up on their butt then use their hand to agitate it and get themselves clean. In countries that do this there's shit all over the sinks because of course your hands get shit on them.
European bidets are better, you have running water but it's not a jet pointed to your asshole so you still direct it and use your hand to get the job done. Since it's running water and basically a sink for you butt they typically keep a bar of soap nearby so you can get your hands and butt properly clean at the bidet.
Japanese bidet use a jet of water pointed at your asshole so it can get you pretty clean without using your hand, then you can use a square of toilet paper to dry off and make sure it comes back clean. As someone who travels, the bucket countries are disgusting, European bidets are fine and nice when you want a butt wash, Japanese bidets are nice and do a good job, toilet paper only works just fine as long as you're not too lazy to clean yourself properly or have one of those peanut butter shits that take a while to wipe off.