In the interest of not taking up too much space, I will not quote, but it is the truth. Not having Lu is like being a Jedi with a steak knife. It gets fewer line snaps, and the "equally good at large + small fish" thing really is a big deal, especially since some valuable fish break "small fish" rods but are "too small" for rods like the composite. Plus, many locations have large and small fish mixed together, and both are desirable.
Ebisu is e-peen, to be sure, but you can catch any valuable fish (that sells well) you like and get to 96 doing it with Lu.
XI Wiki

