I was thinking that Blizzard should maybe stop spending time on new systems like Artifact/Azeroth power, Netherlight Crucible etc. and instead use their time to optimize the current class talents. Right now most specs have cookie cutter builds and I think that if Blizzard started spending more time on the talents instead of on new systems, they could make it more possible to really have more talent options. Some talents will of course always be better than other but if the power gap between them could be reduced it would make the 2nd and 3rd best talents in a row more likely to be used.
This is not intended to be an "I told you so" post.
I just wanted to put focus on: "creating new systems vs. optimizing existing systems" for the future expansions.