I agree, I severely hope 5.0 is the tank and healer expansion. They need more diversity in their kit and flow. Stormblood DPS is a good foundation and transitional period and I foresee few issues in terms of aesthetic and flow moving into Not-Garlemald. Black Mage isn't like Machnist isn't like Monk isn't like Dragoon isn't like Summoner isn't like Samurai isn't like Red Mage.

They need to cement a mechanical theme for each the tanks, as the aesthetic theme is fine. They play too identically to each other, and that's partially why Inner Release, in every iteration thus far, has been so notable. For that window, Warrior breaks apart from the 123 123 123 and just goes HAM. No matter how effective it is, it has as you mentioned the 'Wow factor'. Meme Cleave aside, that feels good, and as a foundation ability, it opens up the opportunity for Warrior to have stupid interactions down the road, and that's good. In this regard, warrior is pretty much set. A calm period before a window of furious button mashing.

In my opinion, moving forward, Paladin and Dark Knight need a similar central mechanical theme, along with any other tank that gets introduced.