Harmony - Troop Symmetry

I don't like the dragon from Heroes of Might and Magic VII. It doesn't fit in terms of appearance or tactics – we already have tanky Ents. Also, walking dragons are not original – similar ones exist for the Dwarves. Furthermore, it's not canonical from the perspective of the classic games.

Oh, but now everyone wants to make everything the way it was in Heroes of Might and Magic III – that's absurd. Earth elementals are something large, unwieldy, sturdy, robust, invulnerable, slow, and powerful, and most likely not flying. Besides, the argument about lack of originality isn't valid, because just as you said, "walking dragons are not original – similar ones exist for the Dwarves", you can say the same about the flying Air elemental dragon – similar ones exist for the Tribes of the East
in terms of tactics – the Unicorn has been replaced by the Phoenix – meaning the ratio of infantry and flying units in elite troops hasn't changed.