I've been wondering...

Final Attack has a bit of mixed reactions. In the early days, it was probably one of the best skills I had when grinding on zombies. There are pros and cons of FA, but for me I believe the pros were the MP save and the fact that it was easier to kill monsters because (for polearms, at least) PS/SB followed by a FA was faster than two PS/SBs. Of course the cons are that with spearmen you're limited to a 60% success rate (I believe pages and fighters was a bit higher, or that was the damage but either way their FA was better), also you can "miss" (not accuracy wise, but game physics wise) the monster and be left vulnerable in the FA animation.

These days though, there's builds that can go around skipping FA and putting the points into other things, such as an extended booster. My old build from the beginning of GMS was 9 Spear Booster, 9 PA Booster, and 30 PA FA. I had to play hybrid for the sake of ease in training, but switched to pretty much permanent spear. I do use PA from time to time but I have Fury to use now. The main thing is that FA is up to you and with the extended ways of training (easier monster:exp ratios, more PQs), most people realistically skip FA; spearmen really don't need it since PS/SB get replaced by 3rd job, however fighters and pages have more use for it in their 3rd job since they're stuck with it until 4th.