I do agree that FF14 has a teaching problem, in that it doesn't really do much to teach player's mechanics, rotations, etc.

It's easier to teach in single-player games, because you can teach a player a new mechanic and then put them in circumstances where they have to correctly engage with that mechanic to progress. Do this a handful of times and most players will learn the mechanic.

I sometimes watch some of my less-skilled friends play, and often when mechanics appear they can either be soaked or the rest of the group is competent enough that the death of one unskilled player doesn't cause a wipe. So the content gets passed, but the mechanic doesn't get learned.

And over time, there's this cumulative effect where more mechanics are added, and the player still doesn't know the old ones, so there are more opportunities to die. And if you die and it doesn't wipe the party, you stay unskilled, and you know you're unskilled, and that's a crappy place to be.

It's wild to me that the game itself doesn't have anything like training facilities where such players can be taught about mechanics: here's what a stack marker means, here's what two stack markers mean, etc.