Must just be a peeve of mine. I enjoyed seeing the "Mastered!" appear after completing Ramza's Squire job haha. Although after reading what you just said, I guess it's not really mastered quite yet. I don't mind leveling at all, prefer to have more than enough gil at any given time, and like playing around with attack strategies, so for the most part mastering most of these will come easily even if it is obsolete. I suppose another perk with my odd leveling scheme is when I'm in story-driven battles, all my characters are level ~20 while the enemies are level 10.
Just got done with the first battle in Ch. 2. I'm guessing I only understand 1% of the game's mechanics at this point, will probably scroll through BlondeWolf's discussion thread and hopefully dodge any spoilers mentioned in there