When I see comments like this, I know the poster doesn't go out into the world at all.
Zones are populated now. They're very populated right now. I'm on a low pop (for NA) server and I see players all over the place whether it's when I'm out scouting to run a hunt train in Shadowbringers zones, grinding daily bills in HW and SB zones so I can buy more Aetheryte tickets on alts, gathering materials just about anywhere or leveling up my latest alt I started just 10 days ago.
Just because the content in the zones does not appeal to you as a level cap player does not mean the zones lack for content or lack for players doing that content.
MSQ
Side quests
FATEs
Treasure Maps
Hunts
Gathering
Beast tribes
Sightseeing Log
Leves
If those things don't interest you, then they don't interest you but that content still exists and is still getting used by other players.
Now imagine dumping open world PvP on top of all that. What do you honestly think would happen?
You would end up with new players quitting the game as soon as they start because other players would be out to make certain they never get a chance to enjoy any of that content or progress their characters.
This isn't WOW where you could dungeon grind your way all the way to level cap if you want once you complete the starting racial zone. You can avoid the open world until you were ready to join the gank squads and that's what most players would do on the more balanced contested worlds.
Here players must engage with the open world to level because they can't unlock content without doing MSQ and MSQ requires doing content in the open world.
We have no lore to explain why open world PvP would exist, unlike WoW with the story rooted in the Horde/Alliance conflict. The Grand Companies are not at war with each other and Garlemald is not a playable faction. How do you explain killing each other?
Like I said in the early part of the thread, you're the WoL and if the WoL goes rogue the GCs would have no choice but to terminate him/her because that sort of power can't go unchecked. Has it dawned on anyone that the Scions stick with the WoL not just because they're working toward a common goal but because if the WoL did go rogue, they would likely be the ones tasked with bringing him/her down? They have faith we will choose to do the "right" thing but you can also be sure they're prepared if we don't.
Again, I don't have any objection to SE creating open world PvP specific worlds as long as open world PvP would have zero impact on my game experience. But I also don't see it working out in practice. Game lore and leveling design do not support it.
What do I think would be a better idea? For SE to create an offshoot PvP game based on the truncated timeline from the Eighth Umbral Calamity. Open world PvP would make sense with what we know of that timeline. An offshoot game could import the existing jobs, races and zones from this game though future changes to this game wouldn't reflect in that one since it's a divergent timeline as of the moment the WoL touches the beacon that takes him/her from the Crystal Tower to the First. Perhaps players could even import their character models and any purely cosmetic items such as mounts.