We have one person with 75 PUP in our LS; he also has RDM, NIN, BST, and PLD at 75. He's...awfully excited about PUP, and it does look like a fun job, and we try to let him use it when possible. But sometimes, we have to say "Sorry, but we need something better in that party slot; please bring this job instead". Obviously if what we really need is a NIN or RDM, PUP is not going to cut it. This is especially true if you're, say, splitting up into small groups for Limbus. I don't get to use my COR all the time instead of my BRD, either, and that bothers me not at all. I have more fun on it, but "using COR" is a secondary goal to "getting the job done".