True. But I think it's fairly obvious at this point we can't trust the designers to make the two work together.
I don't think it's because they're all stupid dumb dumb heads, though. I think the medium just makes it challenging; interactivity and story telling are not easily fused.
But again, that doesn't make it impossible and doesn't mean that any game with any story is "bad." I personally really like Bungie's solution with Halo (basically make two separate games and then fuse them in to a single "universe"), but I also understand that this approach is becoming prohibitively expensive. I'd add that not every game needs to be mechanically focused and that having a wide swathe of different approaches is a good thing.