If you fulfill job #1, you can start focusing on job #2. Which is more DPS. This is why STR accessories or i90 penta accs exist.

PS I've beaten t9 5 times with i90 legs/belt, with 30 STR allotment. I'm putting such a strain on my healers I'm sure. So mucht hat one of them went 0 MND allotment to prove a point.