Quest design
As much as I wanna criticize act 4 for being stupidly long at least you can overcome that quest with skill, even 5.1 you can still overcome that challenge with skill but with 5.2 they just said,
**** it we let's make our players spend as much money as they can to complete it...
I'm not really a fan of those poorly designed nodes in 5.2, let's hope that in couple months they balance it out cuz I'm not planning on spending money to complete any of that....