it’s in the open, it usually allows splashback, also peeing standing up is not that good for you anyway. not washing after you shit is quick and easy too; doesn’t mean it’s good. speaking of which, I think urinals encourage people who don’t wash their hands because it’s quick and easy.
while there isn’t much difference for healthy men (at least according to some research so far), for some people with urinary concerns sitting down is better for emptying the bladder and having a better flow. although I’d argue even with healthy men standing while peeing almost guarantees splashback so sitting down is superior either way.