Mandatory Tutorials in the beginning of the game as well as the skills one get as they lvl would/needs to be looked at.

At the bare minimum give everyone the respective skills they need to understand baseline, as in:
Tanks get:One AoE ability, One Defensive Cool Down, Provoke, And one SIngle Target Ability
DPS Get: One AoE ability, One SIngle Target Ability, One form of a Regen Cool down
Healers Get: AoE Heal Ability, Single Target heal Ability, One Single Target Damage ability, and one AoE Damage ability

By revamping the early game, and scaling it to account for the new changes This would make People have a base understanding of the game, along with a Tutorial where these abilities and skills must be used X amount of time to proceed. In my opinion its not a matter of if people play XIV casually, its the fact that some people are truly lost and don't know how this game functions. Asking these people to just understand what their roles does shouldn't be seen as asking the world of them. Because if more players just started kicking everytime you got these type of layers that would eventually become a problem.

In fact a few months ago I had an entire group of people (not a single one of them new) In Orboone, who were so used to being carried that myself and a friend who came with me for rouls had to teach people their roles, how to do certain mechs etc. Now this may have just been a really rare occurence, but that many people at max lvl shouldnt be that incompetent. In a recent interview YoshiP himself even said Such content as Allaiance raids are made with players in mind who just suck at the game, and thats just it, if too many players who suck at the game are in one place, its honestly just a vote abandon. But I digress.

Its not Elitism to ask someone to know the basics of their role, its not mean. the onus is on them for holding others back in group content. Thats life, if you work a job and don't know your position,you get fired.All in all, if you're not willing to teach, kick em, and black list them, they will be someone elses problem, and will either learn eventually, or just stop playing eventually.