I agree that it's pointless to master most buffs before 3rd job. However, afterwords, as you gain way better equips and stats, having everything mastered is to your advantage. After you change to 3rd job and get your build mostly squared out, you really need to start mastering just about everything.
I've had no problems with my build ever, except maybe the possible omission of Flaming Fist, as without insane myshop you can't really do much with it.
I also want to point out why you'd need Eagle Eye and Counter Punch so soon. You don't need those skills until you want to kill Count, around level ~170, which it's better to master the buffs you need for PvM (Pumping, Adrenaline, and Bull's Eye)
However, I do commend the low TM usage of this build. The only major difference from mine is the build after 3rd job.