Originally Posted by mwebb
you can learn a great deal from scan data
Very true--but you have to actually have a physical piece of equipment to test on. The "Engine Analyzer" lets you test many different simulated engines with different induction, exhaust, possibly different jetting, and so on.
It is no substitute for testing an actual working engine, it is a complement to that. It can help you avoid dead-ends when trying to spec out an engine setup that you want to build. Once it's built, then you can test and tune and optimize.