I'd be willing to bet that 85% of the player base has no idea what's going on in the story. Completely oblivious to the fact that this is a numbered Final Fantasy title, people just want end-game content, which already has the team work element you want.
Don't get me wrong, I want more stuff similar to Final Fantasy XI (similar, not copy/pasted for all of you with easily bunched panties) in terms of story progression, instead of just trading in a bunch of seals to rank up. I want content, missions, dungeons to explore...but I also realize that it's 2012, and hardly anybody actually cares about that stuff anymore. It's all about getting the best gear so you can do the next thing to get the next best gear... It's sad.