TL;DR Overall better and shorter explanation is - we need opt in for competition instead of opt out.
At least we need outdoor faction imbalance fix. Playing Alliance is pain even with WarMode off due to "orange sea" and "grey mobs" around.
Yeah, we will have cross-faction instances in 9.2. But outdoor stays the same. You still compete with other players by default, even if they're from your own faction. And you still need to explicitly group with not more, than 4 other players, if you want to cooperate with them. I'm not 100% sure, but I think Wow is only game, that has such design. Don't you think, that such design is obsoleted and isn't acceptable for PVE game with WarMode off? Don't you think, that in PVE game players should cooperate by default and compete only if they voluntary choose to?
My opinion. You don't have to agree with it. I just want to remind, that PVP is literally playing versus other players. Killing them isn't necessary in this case. You don't kill other players in card games or chess. Competing also falls into "playing against" category. Because you can also win or lose. Don't you think, that "cooperating to play versus NPC" - is only right way to play PVE game?