I guess it depends on taste.

PLD, WHM, MNK, and BLM use the original LBs for Tanks, Healers/BRD (in ARR BRD used the healer one - and yes, this DOES mean they could combat raise the party if the healers were down, saving from wipes!), Melee, and Casters, respectively. I'm not sure when they added the new ones...SB maybe? Or HW?

But some are to taste. Like I like WHM's because the WHM Job fantasy is kind of "the quiet strength that faith brings", so kneeling before a staff to pray for aid seems on point. On the other hand, I'd like PLD's wall to be more...I dunno, holy and etheric somehow? Like imagine if the walls were blue-white and SLIGHTLY transparent holy energy rather than metal appearing from no where.

I also really like the Job LB3s that include the wielder's weapon. Like contrast AST where the starglobe rises into the sky then bursts into the constellations vs BLM's where the staff just vanishes, they get a magical staff to summon Meteor, then their weapon just kind of unshrinks/grows out of their hand.

And some are just a matter of individual taste. I love SMN joining with Bahamut to unleash a more minor, controlled version of the Calamity. It's like High Summoning Bahamut. On the other hand, I find NIN's to be way too many hand motions for what you get - a minor quibble, but it still bugs me. RDM's, on the other hand, I get the visual quibble and what they're going for...but my god, that stupid thing is blinding and tends to get people killed whenever it's used. The visual is just WAY too much.

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Not sure what I would change or replace given that, as I realize everyone has those different preferences. You might hate the WHM one while I love it, for example. And you like NIN's while I dislike it. And if we COULD agree, I'm not sure we'd agree with what to change them TO.

Definitely a tricky thing.

I would say that, if there was a short list to change, I think most people would agree MNK and probably PLD are on said short list. But then again, some people like those, so... Would also be kinda funny if they left the old ones in the game for just classes (for people desperate to see them again they could do unsynced Ifrit and use them in Gpose there or something. )