the iLvL gear you get from Myth is 90. ILvL gear you will get from Crystal Tower is iLvL 80. So if you theoretically got myth per class you would skip CT and just do the content which gives you the best gear for the slots. Why wait for drops from CT when you can just grind WP with all your classes and be done for the week. You will have all the gear iLvL 90 and then be "bored" till next expansion.

(there is hyperbole there but yeah)