MoP’s class design was horrendous. The game does not benefit from having so many abilities that our keyboards fill up with so much CC and utility that people spend 80% of their combat time being in CC in arena or BG’s, or where we have 7 defensive cooldowns and 6 offensive ones (that we macro together, of course)
If you want it to be like Classic, which some of your post leads me on to believe, then what needs to happen is that extremely streamlined and simple, yet powerful, spells, need to be replaced with spells that are less streamlined and more situational, but also more unique.
And that is exactly what they are doing. Well, with the exception of Covenant abilities, but otherwise it is.