Could you please define who "play the way you want" is meant for? Is it really meant for everyone, including the end-game raiding community?
Part of the reason raid teams are so critically optimised, with people forced to play certain roles and/or abilities is because of how overtuned the content is, especially recently.
Take Reef Guardian HM, a fight where a DK tank is king simply because of Magma Shell allowing you to ignore most of the damage. How would a Necro tank compare here, or a NB? I'm not even going to talk about how bottom-of-the-ladder Templar tank is, a class that is supposed to embody the paladin identity and one I would have thought should be second behind DK. Is this the "play the way you want" mantra in practice?
I get that each class should bring something to the table, to have some measure of class identity, a reason to go "Oh, I want to play that class because". But it seems recently you cannot balance that with "play the way you want" in the settings that test the player the most. If that's the way it's intended to be then so be it, but I'd prefer you to outright say that, instead of just repeating the same buzzwords.
After U35 any mention of combat changes fills me with dread and foreboding.