Correct me if I'm mistaken, but weren't pencils ruled out by NASA because of the dust they create when they write? The toilet engineering could be a similar situation. These people are professionals, we should not assume they built it like this for no reason.
This is a well-known effect, it does make a significant difference. People feel safer driving slower when the road has obstacles closeby or when it's curved. You can use this to slow people down with bollards, small curves, or even trees near the road in rural areas.
I haven't found that to be very accurate. I suspect the internal idiosyncrasies of a company are an issue, as the AI doesn't have the necessary context.