max12590
Masterful Geek
Contrary to what you are saying many PSUs are built for more than just powering the system. PSUs are also built to exhaust heat form the case. While yes, of course, a blowhole on top would be good, the PSU would still exhaust. They are designed to do this. If they weren't then they would intake air from the back of the case and exhaust it through a hole in the top of the case.