You now have the other plural answers from Tuco.
Combat responsiveness, server architecture, itemization, I am also assuming PvP leveling stagnation and being forced to PvE for VR is also in there. Let's not be coy about it. There is a shit ton Sage won't allow to happen. Not sure why you continually defend this guy. At this point anyone in the industry can correlate Sage is horrible for the industry like the sky is blue. It doesn't need any type of proof. (And I say this because Sage is in charge of the game development and locked down design.) And one of the reasons you don't see anyone speaking out about it is because once anyone does, they are blackballed from the industry.
Welcome to Iran.