What I think people don't bring up is how good BLU is for temporary events like the Moogle treasure hunt and rare collaborations like Yokai.

If you want faster results than casually bumping into dungeons that give law tomes, BLU is your best bet. Get some spells, PF AV and get yourself some easy tomes. Bonus that it's also fun blowing things (and yourself) up.

And with how frequently they add the Moogle events and with Yokai coming back after 5.3, BLU has a little niche for itself. And the content and job being enjoyable is a huge perk.