I worked for a company that had among other products a simulator. The architect was somewhat of a curmudgeon but really knew his stuff. He really drove home the idea that you need good measurements to validate your simulations. The best way to enrage him was to show him the all-too-common customer question "why does your simulator give a different answer than this other simulator?".? A much better question would be "why does your simulator not match these good measurements?". There are so many ways that different simulators can vary even with the same models that it is never a fun exercise to determine why they differ.
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So simulation-based arguments may be interesting, but unless there is the built and tested prototype it is hard to know whether the simulations represent reality or not.
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Mike M
