Kaiten

[Mortex]

BLM is another outlier though.
Foul gets replaced by Xeno for single target once you reach 80 and is only ever used over Xeno for cleave damage at 2+ targets. It could be merged with Xeno since Foul also gets traited to being an instant so it's a bit in the same boat as SAM's skill. It doesn't use a single skill in aoe and single target, they're completely split once reaching 80 and it's only Foul before that. Even Freeze as a recovery tool on boss fights when you dropped Eno died as it now requires to be in UI in the first place.
Not that BLM lacks real estate on its hotbars but I wouldn't mind if they merged Foul and Xeno. I think the aoe/ single target split is a bit outdated in general and since SE isn't big on designing add fights, even the "But more class depths!" argument falls flat and all it does is take up hotbar space for more interesting skills - or at least they could add some procs/ synergies that occasionally make you use aoe skills in single target.
But as they are right now, they don't really add anything. You have your single target 123 and your aoe 123 with a couple of "use on cooldown" skills.

I do think making the fire IV rotation a aoe would be actually not that bad. It’s a insane looking cast that has umph behind it. The aoe rotation is expect flare pretty whatever and you could still use flare before fire IV

[Rilifane]

I do think making the fire IV rotation a aoe would be actually not that bad. It’s a insane looking cast that has umph behind it. The aoe rotation is expect flare pretty whatever and you could still use flare before fire IV

It would make a lot more sense to merge Fire III and High Fire as both grant AF 3/ refresh the timer, Blizzard III and High Blizzard for the same reason but with UI3, Freeze and Blizzard IV as both don't grant UI/ refresh the timer but instead grant 3 Umbreal Hearts. And, as mentioned, Foul and Xeno as they're functionally the same once Foul gets the trait. Flare and Despair also work because both are your finisher and the merged skill still get used only once for single target but twice or more with MF/ Ether for aoe.
Fire IV is the only skill that shouldn't be merged with anything as it has a unique spot by not refreshing the timer while providing highest potency outside Polyglot skills and Despair.