PE … requires dedication and consistent effort. We all know that we can get into reasonable physical shape by eating well and getting moderate amounts of exercise, but people selling fitness magazines and fad diet plans aren’t going to go broke any time soon.
It’s as if nobody knew about pushups, situps and jogging - but everybody knew about expensive, informercial-advertised exercise equipment and gym memberships: and assumed (correctly) that those didn’t work.
Maybe the mass unawareness and angry homophobic reaction (touching your own dick is gay?) to the idea of natural, effective PE is because of a mental block in most guys that prevents them from being conscious of yet another self-improvement regimen they don’t have time for.