I think you bring up a good point, shion. Any love story aspect seems outside of the focus of the game from what I remember. (Of course, I still have yet to ever beat the game). I think Vaan and Penelo may have had some love story elements maybe, but it wasn't really prevalent. I could be remembering that wrong.

Since it is what people are used to, people probably are just trying to create a love story that doesn't exist to fill that seeming void.