If it's POTD's fault that some kinds of people can somehow get to 60 without bothering to read their action descriptions even once, shouldn't they reduce the exp from that and from levelling roulette and force people to level using slower, unsynced content? I mean, who learns anything about playing WAR at high level by tanking Tam Tara Normal daily for a month with a tiny portion of their eventual moveset unlocked?

I think the wrong thing is being blamed here. The lack of level-appropriate ways to get stronger and the lack of content which forces you to do something other than faceroll the keyboard until endgame are the true issues.

(Disclaimer: I have never used POTD to level in my life.)