If American Idol—not to mention its intranetwork rival X Factor, and even to an extent its blind-taste-test copycat The Voice—were truly a singing competition, of course, matters of styling and “marketability” would be taboo subjects, and the contestants would only focus on getting as much vocal rest time and tea as they could before their 90 seconds were up. (No taping of extraneous commercials for Ford for these kids). But of course it isn’t