Strong auto attacks is not a fun mechanic that really improves the experience of playing a tank. That is just a balance adjustment, and if anything that's more for healers than for tanks. For tanks you can add things like mechanics where you need to bait certain attacks, add more interruptable attacks, make sure the 2 or 3 tanks in the raid are actually needed by adding additional entities to far more bossfights. And other stuff that actually adds to the experience of playing tank.