Now you are moving the goalposts. World Quests are world content regardless of what they are. Almost everything else you mention was never in the game to begin with. There is a ton of world content in the game, but it seems you are intentionally discounting a ton of stuff to make your claim.
That is hardly anything compared to the amount of content in the rest of the game. PvP is basically nothing but a side game. You romanticize the old game, yet there was practically ZERO in terms of world content at the start. It was raid or nothing. There is far more to do out in the world now than there ever was.Also:
Warfronts are instanced.
Island expeditions are instanced.
Certain quests have instanced parts (Basically the modern version of scenarios... which also are instanced)
Large scale PVP is instanced (Battlegrounds)
Small scale PVP is instanced (Arenas)
Raids are instanced.
Dungeons are instanced.
There's also phasing, but they've thankfully cut back a lot on that in the last few years.