I'm sure it's been said on here a thousand times. But we had Warden Towers in Legion as PvP objectives, and then just remove an idea like that from the game in BFA until Nazjatar, where they kinda brought it back.
With the introduction to War Mode, this would have been an excellent addition to the game. Could have had big fights at the towers (or whatever objective they choose). This was a sure fire miss for Blizzard. I know alot of BFA has had problems, and PvP is a big one. This is coming from someone who rarely PvP's. I could make a rant about how War Mode needs more incentive to play, but I'll save that for another thread.