Can anyone else confirm this and bump if they feel the same way?

I think at least the first time you play through you should have a chance to watch the story line and engage with it by learning how to battle bosses. I can't tell you how many times I've had others reveal key moments about bosses that I just wanted to learn on my own.

In movie reviews, I think they would call it "movie spoilers" - in this case, anytime you play with others during storyline duties, the other players behave like "final fantasy spoilers" - jumping past gameplay elements in duties, telling you how to make it easy to defeat a boss (without challenge for you), or beating them all for you as you helplessly get excluded due to a storyline cinematic.