You are right, you can't get it 100%, but you can get very closed to it, there is a lot of secret stuff for weapons, RDR, and avionics systems in the legacy hornet, but with today’s technology, it will be impossible to recreate it or maybe not even necessary to imitate it 100%, i.e.: I don't think is necessary create a built-in-test for hydraulic system when in real life it can only be done on the ground; instead you can put the feature and have a GO. Then in-flight you can have cautions and advisories for it, but that's other story.
In my opinion I think is important to have all the avionics functioning specially storage management, but, majority of PC pilots don't care about that, don't even know or have the intention to use it. You can put all that money and development in some that your return is going to be very limited because pilots don't want to buy some that is too technical.
The solution I see is to have 2 versions; one the easy start-n-go, and the one more technical, that way you guarantee some kind of return of the investment and still maintaining high standards and good reputation in our community.