That's some good points. I never thought about /NIN before but thinking about it, it would be a natural option for RUN (inspiration utsusemi would be pretty great). WHM sounds good for general things, then /rdm or /nin for big fights. I usually solo or duo with a DD friend a lot so I end up need the cures from RDM sub, but if I've got a healer, yeah RDM becomes kind of pointless. I do have NIN leveled so I'll give that a shot and see how it mixes for me.

And I do agree that "If it works, it works" in regards to the subjob choices. RUN basically has everything it needs to do what it needs to do, the subjob just adds a bit more versatility in certain directions.