But not to the usual extent.
So since I have actually played this game twice despite my low opinion of it and seen others play through it as well (I lived in a village, I had to travel fair distances to visit friends and even then many of them played FFX in front of me so due to transport issues that would become my day, many times) I, and said others, found Valefor more useful (and novel) than Lulu at times when use of elemental spells was absolutely essential in the initial stages, and then found that Yuna actually reached the 'ara level spells before Lulu did because we all used the advanced grid... and was more efficient with them.
Did anyone else do this? I found it made Lulu a bit pointless after a while.