Honestly, when we were listening to the communication of Ghostcrawler he did not have the best logic I have seen, but it was still better than the current mentality of WoW.
There is plenty of the best people that left to work on other projects too like Jeff Kaplan (Overwatch now).
I really truely hope they change the direction of WoW to cater to the hardcore audience, that is what worked in Vanilla, TBC and less so but still a bit in WotLK.
I have no idea what direction they will go. Legion is just another casual as fuck expansion. Are you guys aware it takes 2 weeks to fill the entire Artifact tree for instance? It is not the saving grace of WoW at all...
We can only wait and see what the expansion after Legion will bring to figure out if anything changed.