I really dig all of the new changes in Legion for PVP, because it's just allowing it to be FUN. I'm sure they will continue to balance it, I'm sure they will continue to iterate on it, but I think they finally realize WoW PVP is at it's strongest point when it's accepted for what it really is... a supplementary activity for a primarily PVE game.
Truth is, I believe Blizzard is starting to realize that the more they take their hands off the wheel for PVP, the more fun it is for players. Compare Ashran - totally overdesigned, they thought about every little intricate detail, to Wintergrasp or Tol Barad where there were few, simple objectives. Those were so much easier to hop into. You also have the most popular BGs with basic rules: WSG, AB, TP, BFG... capture the flag and "domination".
Then you complicate things further by letting people WAY outgear each other... so it's no longer fun for new players to just hop in. Or even just casual PVEr's that want an occasional taste in PVP. PVPers will always have the skill and experience as an advantage, they don't need a further advantage of +X dmg,hp, etc over everyone else. It just makes most PVP a slaughterhouse for the PVPers and everyone else is a lamb to be sacrificed for their own personal enjoyment.
Blizzard knows that Overwatch, HotS, etc ARE at their core PVP games and should focus on that. And I think that's why we're seeing a drastic shift in WoW PVP... which should just be a casual side piece of content to do for the majority of the playerbase, who are PVErs.