Some people use whatever fits, but some people also don't care how their bike feels when riding it. For some, a bike is just a thing that moves when you pedal it, and for some it's a finely-tuned, responsive machine. A wide tire on a narrow racing rim is going to feel pretty mushy when cornering or descending on twisty roads. Even 28mm is pushing it as far as that goes, no matter what the websites and charts tell you.