Please implement something to teach players how to play

[Rilifane]

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.

WoW does this, SW:TOR to an extend.
Swords of Legends online does this quite extensively.
You have several brief tutorials throughout the leveling phase and a pretty big one at the end which walks you through most of your skills, how to combo them, how to spot and interrupt certain boss skills, a role trial for both specs of each class etc. and even has a theoretical test at the end which you will fail unless you answer questions for all three roles correctly. Though you can leave the area, you cannot progress until you sucessfully passed all the tests.
You literally cannot do any max level content without completing it and with the vast majority of ingame activities tied to max level that's basically locking you out of the whole game.