I would probably be better off if I leveled things because of their utility. My 2nd job to 75, and my main, was PUP and it bugged me that I was utterly useless in most people's eyes. :/
Sounds like my BLU back then lol. I went BLM > BLU > DRG > DNC + RDM (Abyssea happened around here) > NIN and now DRK, but as far as my shells were concerned I was BLM onry. I could reliably stun, knew how to time sleeps, and did ***like cast Dia II on targeted mobs because the RDMs and WHMs were *** idiots and couldn't do that or anything else beyond casting C4/5 (haste/refresh where?). Not the best as damage/nuke went at the time, but arguably still one of the best mages we had. Playing BLM ~5 nights a week burned me out in a hurry though, which is why it's still 75. I'm only just now touching the job in any way again through our RDM/BLM/THF mule (yes, I have RDM geared on two characters >_>;).
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Honestly I can't look at something and think, this would be useful here for this or this and then level it for that reason. I like helping a group but I can't play jobs I don't enjoy fully. I've leveled one job for it's usefulness and that was MNK, and part of that was just to help with Dragua kills whenever I get the chance to work on my Vere more for PUP. However I did start to like that job a little bit more after getting counterstance and being able to just be like "BIIIIITCH, you gonna get countered!" >.>;
Given the way the game changed towards level cap my approach was to at least give the job a fair shake and see how I liked it in that environment rather than judging it based on level grinding hell. Aside from BLM (which probably would have been ok if it hadn't been a near-fulltime thing for a while there), it worked out ok. DRG was fun at the time, I only retired it later because it actually got less fun with Razed Ruins/AF3 and accumulating hate too quickly to Jump it away. Support DNC was awesome but became less useful around the same time, so I ended up playing it less and less. I have gear for it though, so one of these days I may resurrect it and try the more DD-oriented approach. NIN's not horrible, it's less fun outside Abyssea but I don't use it as much outside Abyssea either. DRK... we'll see I guess. I wish it was still good for tanking. RDM should be fun in the limited situations I'll use it in, kind of the way I wanted to play mage when I was playing BLM.