Maybe not increasing the amount of things to do, maybe having a main weapon, and 2 or 3 accessories is enough. But more options and diversity would be great.
Unlocking new arrows/totems/paladin’s books/scroundels cards/shields/weapons/horns…
With different effects, would be nice, we could get new things to try as we level up, without necessarily just adding new things to do, and having to do everything at the same time.
To take your exemple, in WoW, you learn new skills, and you can bind them all on your bars, would be easy in VR.
But in Diablo 3, you unlock skills too, but your bar is limited, and you need to choose your build, and change it as you level up, or depending on your stuff, allowing to try different gameplays.