"Been challenging for us when folks who play 2 hours a night and folks who play 2 a week want to progress at similar rates." (Source)
This is a blue post from the front page of this very website. This should not even be an issue. The fact that Blizz thinks players who put in 2 hours a week should see similar progression to those who play daily is EXACTLY why this game is in a state of decline. This is not about casual vs hardcore, this is about effort vs reward and it is wrong.