I am happy that you agree it really means a lot to me!And I am glad that you see the logic of my reasons! And lets not foget that durign its time Iron Hills was the Strongest Dwarven Realm and one of the strongest in that part of the World in a MIllitary way so it is natural to have a really developed and blanced Army! And some limited Cavalry will fit great in my opinoin and Ram Cavalry does the job perfect!
Exactly, for the lore reasons and facts that you stated, I think, even if it's not the priority now, that the Iron Hills should be changed a bit in the future, focusing on its advanced and powerful military strength and warfare; just like the faction of the 'Blue Mountains' naturally relies on the strength of its great heroes.
That's why I am totally for implementing, wisely and gradually, interesting BOTFA concepts like Iron Hills soldiers, ballistas and ram riders