But the game isn't stuck in the mud and insipid. It's very good for those who want the type of game it is.
Sounds more like you're expecting the game to be something it was never intended to be.
Open world PvP works just fine with flying. Did a lot of it in Outland during BC, especially around Halaa since that was designed as a world PvP hub. Also did a lot of back and forth between Honor Hold and Thrallmar. Those who wanted to PvP would be there. Those who didn't would keep their distance. Flying didn't stop it - it helped those who wanted to PvP get there faster.
What doesn't work with flying is ganking. Gankers get upset when their non-consenting targets have a potential escape route. It's weird how the gankers will then usually disappear when those who actually want to PvP start showing up to fight.
And yet no one is giving SE credit for the new content they added. They only complain that there are fewer dungeons added without mentioning the multizone combat like Eureka and Bozja/Zadnor, or the Firmament (granted the latter will have no interest for someone who is looking for combat content).
Just because you aren't interested in what content did get added doesn't mean there is less content. There's just less that is of interest to you (and I'm going to be highly disappointed if you're actively participating in Bozja/Zadnor at the same time you're complaining about fewer dungeons).
It's not. You can only play against other players in a few designated places. ;-)
Are you certain about that?
It was very easy to force flag enemy players in WoW up until mid-MoP. There were dozens of little tricks to use so someone would end up flagged without their specific opt in. Even after Blizzard had addressed most of the tricks, new ones would be discovered or bugs would happen.
Let's say there are very specific PvP worlds created and open world PvP is only possible on those (which I doubt can happen considering how SE has to mirror everything world to world from the number of zone instances at expansion start to housing wards).
What about the player who just wants to get their MSQ progression or other content completed without being interrupted by PvP for a change? Tough for them, it's either PvP or don't play?
We saw what happened in WoW on PvP worlds. Players would migrate to majority faction so they didn't have to worry much about getting interrupted while doing other stuff. Those on the minority faction who didn't want to play the majority faction would abandon their characters or transfer to another world that either had their faction as the majority or was not a PvP world.
The majority faction had almost no one left to fight outside of a handful of diehards who were actually interested in world PvP. Cries of "Blizzard, do something! Make my world balanced again so I have someone to fight!" would fill the forums and yet those players who claimed they wanted to fight would never take the obivious step and change factions so they would have thousands of players to fight.
If world PvP doesn't work in the long run in a game that was supposedly designed for it, how well do you really think it's going to work in game that was not designed for world PvP at all?
Keep in mind we don't have factions as a basis for PvP here. SE had to pretty much give up on GCs for PvP and put everything into mercenary mode because players all flocked to what was perceived as the winning GC.
How many players are going to opt-in to participate when it's all FFA and any allies you recruit are subject to friendly fire?