I don't think I am being unjust, I simply believe that state space and transfer function methods should be used for different things, that's all! I never said state space was bad, all I said is that in DESIGN, the frequency domain has more advantages. People are different and some may find that they get better insight into design using state space, well that's fine - no problem. I was merely expressing my opinion of what I have found in my own experience.
You can implement a digital transfer function in difference equation form, but the roots of a high order polynomial become extremely sensitive to coefficient values, that's why high order digital filters are made up of cascaded first and second order sections.