Before I start my piece, I won't lie - I have BLM, NIN, MNK, BLU, and BRD all leveled. I've got "desirable" jobs leveled, so it may seem like I'm biased. And maybe I am a little biased, it's possible. That's just my disclaimer here.

For seal farming? Heck yeah I'm going to go for the "desired" jobs. I prefer to seal hunt with NIN/BLM/WHM, and then the last person is a THF or BLU. I rarely go for more than 4 people, because if I assign one person to a seal, that minimizes the number of seals required. If I have two people on a seal, and let's say it's a rare one, then I have to stick around longer. I hate being rude and leaving people without completing their seal sets unless a mob is being particularly annoying (looking at you, Ironclad Smiter), and so adding more unnecessary people means I have to waste more of my time to help finish. Sure, I could just be rude and say "welp, I'm done let's go" but that's just not me.

For larger events? You'd be surprised. I like to get my "necessary" jobs, of course, like NIN/WAR/THF/WHM for Emp item farming, maybe a BLM if people still need +2 items. Besides that, however, I generally pick people for their skill at a job. One of our members got to come on COR because we were set for Sobek, and honestly he was a huge asset. Wildfire was a good 4-5k per shot, Tactician's Roll for 5 TP/tick was amazing (especially with me on BRD, I could fire off staff procs after singing), and overall his utility was hard to argue. Our shell leader often comes on MNK because he's amazing, despite us rarely going for blue procs.

Sure, some of my jobs get put on the backburner - SAM, COR, and SMN don't get much use - but other jobs that seem "unpopular" like my RDM do fine. For example I'll duo Dynamis with RDM/DNC + THF/NIN and bring in a good 2M worth of currency a day, or trio RDM/SCH + THF/NIN + NIN/DNC for more. BST? Well that works well solo anyway. It's true that some jobs have situational niches now, but that doesn't mean that they'll be useless forever.

Jobs have always been in trends; look at ToAU. SAM, DRG, and occasionally WAR were the jobs desired. They had the greatest damage output at the time, and RDM was the king of healing due to having an easily replenishable MP pool. BRDs were required for just about every party. In Dynamis you'd have a few BLMs because they were skilled at crowd control, and during endgame, you'd have a PLD tank. NIN tanks were rare, but they were there occasionally. I rarely remember seeing MNKs in endgame, honestly, and if you were a BLU (I know I was during those days!) then the only thing you were brought along for was SATA Cannonball.

The only real problem I can see is the limitation on EG activity. To most people, this is Abyssea-only, which limits the range of potentially necessary jobs. Some people move to Voidwatch, and can use a broader range (I get to go SMN for it, it's fun!). But for the most part, we don't have 3-5 different types of EG anymore (Sea, Sky, Limbus, Dynamis, Einherjar, etc) where different combinations of jobs are useful. We have ONE (two if you're lucky enough to have a group to do VW with) endgame event, which cuts down that list drastically.

My only suggestion to SE is to open up more events when we hit 99, so we can get out of the current mindset we have. Right now we're in a transition phase, so it's no wonder that we're limited. But if this trend continues to 99, then yes, there is a problem.