Not even limited in application to 4th job; I think it could serve as a concise alternative to any skill build. Of course, actual skill builds aren't so bad for the first three jobs in comparison.
Magician 1st job, as a trivial example:
Tier 0: MP Increase (req 5 MP Recovery)
1 point wonders: Energy Bolt, Magic Claw
Tier 1: Magic Claw, MP Recovery
Tier 2: Magic Guard
Situational/Useless: Magic Armor, Energy Bolt
For first job it's not so difficult to just say "MP Increase > 1 Bolt > Claw > Recovery > Guard", of course. But with 3rd jobs and some of the less straightforward 2nd jobs, it might be easier than listing out all the levels and crap.
Magician 1st job, as a trivial example:
Tier 0: MP Increase (req 5 MP Recovery)
1 point wonders: Energy Bolt, Magic Claw
Tier 1: Magic Claw, MP Recovery
Tier 2: Magic Guard
Situational/Useless: Magic Armor, Energy Bolt
For first job it's not so difficult to just say "MP Increase > 1 Bolt > Claw > Recovery > Guard", of course. But with 3rd jobs and some of the less straightforward 2nd jobs, it might be easier than listing out all the levels and crap.