Why? If you host everything on the same domain there's no possibility of a typo. And, developers could maliciously make a typo that can get past code review, do

Why? If you host everything on the same domain there's no possibility of a typo. And, developers could maliciously make a typo that can get past code review, don't you take that into account? In a lot of situations the system can be designed that a mistake has to be obvious at review for it to even pass the build step. Why not strive for that level of robustness?