Some skills are absolutely necessary to get that doesn't fit the spectrum of "role actions".

I am a BLM main. So i really want to try how to dps without diversion/lucid. I get agro at the 2nd fire 4, if tank is at dps stance. If not, i get agro at 5th fire4!. I am not sure enmity is broken or not in this game (seems to me it is), but without enmity reduction tanks cannot take agro over a BLM. And mostly SMN as well. (Idk the rest of the dps much about enmity). So for BLM, even we have no mana issues, i HAVE TO get lucid.

Swiftcast. No explanation needed i guess. All casters and healers use it so.. doesn't seem optional to me.

Diversion, again, is pretty much a must for all dps at this point. I see this game as a teamwork so if tank wants to go dps stance, which normally they should if they trust themselves, you don't have any excuses not to have diversion. If dps doesn't use diversion when available, it means they are being a bad dps (not in the term of being a bad player dps-wise, but mostly like they don't care or they want tank to suffer or get the blame for not keeping agro). So diversion has become a part of dps rotation, pretty much.

Addle gives SMNs an extra bahamut weave so, a smn that knows what to do takes it as well. Also, people usually take mana shift because things can go wrong. ALSO, surecast is valuable at some points. Though, i don't think these 3 are a must as the above.

Invigorate. Try to use melee or bard/mch AOE dps without having this. Yeah well, good luck.

Goad. It is again a very useful ability. So, there is no reason this should be optional.

Tactician / Refresh. They lower enmity and plus gives us juice. Again, they are pretty much a must to take.

Protect. I will just say this: (we enter the dungeon, tank is standing still for 1 min... our eyes meet. he silently cries. and then a smn comes and says "dw healer will adjust".

Esuna. Have many good usage. And mostly swapped out by healers with protect. Which is why we are getting expanded i guess.. To have esuna over protect. Which protect is like... mandatory anyway and why we still have that-- oh.. but "a ff game without protect cannot be thinkable!"

I don't play tanks too much but provoke is an absolute must. And also rampart, convalescence, shirk, awareness and anticipation (not sure about this) are useful. Awareness is also a semi-must for warriors with usage of raw intuition.

So what was the point of ALL of this?
I think they should remove role actions all together. All healers need protect, swiftcast, esuna and mana regen. All dps needs enmity reductions or contrary tanks need more enmity gain by their attacks, so either remove diversion and make tank enmity adjustable with dps, or just give all dps diversion basically. All melee / physical ranged dps need tp regen. There is no point of not taking invigorate so... either reduce tp costs for aoe or make invigorate for those jobs. Tactician / Refresh is a part of support dps basically. Because well they are supposed to support... right?

Anyway, either remove all of them and make useful ones a job action, or don't try to sell these things as a role action while they are necessary to play the game optimal.