It's funny, using SWTOR as an example of what happens when you don't merge story with content, when there are quests, in the open world, no less, that require groups, or at least several people, unless you come back once you're overleveled. And some of the most amazing content in that game literally requires an entire 8 man group to complete, and no, I don't mean the raids. Anyone who went after their permanent +10 to all stats buff knows exactly what I'm talking about. You needed people to activate the bridge on both sides, as well as trigger switches in multiple locations, all to get a group of 8 through that gauntlet of puzzles. At least, that was how it worked on Imperial side. No idea how Republic did it. I'm imagining something equally as frustrating.
As much as it might suck to hear it, this game actually is BETTER for making story tie in with instances, especially when this game uses the Level Sync system to ensure that people actually run old content, something most other MMOs completely ignore. You want to run that obscure dungeon in the lower levels? Nah. Nobody cares, since they're all sitting at level cap. Here? Dungeon roulettes for daaaaaays.