Please implement something to teach players how to play

[Shalan]

Again, I ask:

Please give me the names of other MMOs with which you are familiar who do this already.

I suspect the answer will be, as before, silence.

You can ask for 'mandatory', but unless you can show evidence that this is being done somewhere else (and, may I add, successfully) you're just talking through your own frustrations with players who are perhaps not as good at playing games as you are.

Blade and Soul did it. As part of the story, the game forced you into instances/scenarios where you were required to complete certain combos/learn various mechanics in order to progress. If you couldn't do them, you couldn't continue the story. They taught you class specific combos, how abilities interact with one another, different status effects, etc.
If you couldn't complete the mechanic/combo as directed Hajoon would chastise you and revive your target and you would have to keep at it until you could manage your task.

It taught at least the basics of the game and your individual class, and I think the game as a whole was better for it.