If Hayward averaged 4 more points a game, but gave up 4 more points a game, people here would be more likely to call him worthy of a max contract IMO. Same net result, but points are sexy.
That's why it drives me nuts when people are arguing for Jamal Murray, McCollum, Devin Booker and even Rodney Hood over Hayward. Hood is the best defender of the bunch, and he's merely average. McCollum is meh, and the other two are turnstiles...but they can score lots of points, so somehow that makes them more alpha. It's a pretty poor argument if you ask me.
It's the same reason why people think Hood is better than Hayward. They see a couple of games where these players get super hot and can't miss from deep, so they think they are the better players.