Am I missing something or did you not read the post you replied to?
From a practical standpoint Chemistry is not based on QM. You basically said QM > Chemistry > more complex things, my counter argument is even fairly simple. Chemistry is way to complex to model from pure QM. So, even at your first step your model is making simplifications. And 10^100 times the processing power does not get you to the point where you can model even the simplest cell for a meaningful time-frame.
Even at the timescales of atomic explosions and the best hardware / software around those models are vary simplified.
PS: That's not to say you can't make useful simulations, but trusting them to be accurate without testing is not science.
Want to simulate a cell? Even with hardware 10^100 times faster you can't use QM, it's all models of models. None of which are 100% accurate, but that's no reason you can't Kidd yourself.