What is the purpose of this semantic argument? "Does not posses the skill" doesn't mean "has 0 capability of learning", it just means insufficient to be effective. Just like I do not posses the skill to clear a Savage raid. "Everyone can teach" is as meaningless as "everyone can play", nobody disagreed with that.

The point is that many people misread ability to play the game well as equivalent to the ability to teach, but they're different skills, and having one doesn't mean you have the other. If your communication skills are poor, which are core to teaching, your advice will fall flat.

And, by the way, effective communication and teaching skills are actually relevant to life. That's why for some of us, there's very little to compromise here. If you're a tank that doesn't use AoE abilities I will be internally going ??? and wondering if you're playing drunk or trolling or misplaced your keyboard, but if you insult another person for not meeting your arbitrary standard of skill you're lost to me.