they are also super handy for cleaning in general, and bulgarian bathrooms are usually tiled to the ceiling and have a proper drain in the middle of the floor so you can make a mess and it's easy to clean it up and have it go down the train.
i mean, yeah, some bulgarian bathrooms are a little hit and miss on having precision drainage slopes on the floor and stay a bit wet but other than that yeah, the butt guns are also great for keeping the whole toilet clean when people make messes.
i lived with a dude who did terrible things to his intestines and it was mandatory. i suppose it must be a thing in bulgaria.