License board - though I really do wish that weak enemies wouldn't give you any LP to prevent cheap LP farming.

The sphere grid, even in advanced form, just ends up playing too much like an ordinary levelling system with fixed job classes. It's not until late in the game that one can get return, friend, teleport etc. spheres that allow genuine customization. On top of that the speed,power etc. spheres were so common place that they might as well have let you activate the corresponding nodes for free. Had they been scarce there might have been an interesting resource management side to the whole thing.