I would encourage anyone that thinks samples=real to record their best mock up, then have a real section play it, and then play the two results for any ten people. The real thing is always obvious, no matter how good the samples. Without that reference point, constantly at our side to compare, we often get sucked into believing we have reached a point which we haven't.
I don't believe this for a second. It could easily be done and is done every day on television for example. Almost no one knows that samples are being used instead of live orchestras. I do, but 99% of people in an audience do not. Also, I was never interested in merely creating a duplication of something real.
I have had the exact same things that I programmed played live. And the point in programming them was not to reproduce the beauty of the live performance. It was to do a halfway decent performance of the music which was not accomplished by the live players at all. In fact, hearing the sample performance AFTER the live performance was a revelation. Because I realized that the piece I had written wasn't actually as bad as the players had made it sound. if I had tried to reproduce the "real thing" it would have been out of tune strings, clams in the brass, squawks in the clarinets, etc. etc.
"record their best mock up, then have a real section play it" ----- Oh sure, I'll just go and rustle up a world-class 90 piece symphony orchestra and have them do a perfect recording session for me and then I'll post it right here for you. I advise you also, please submit your symphonic size compositions to any professional orchestra and get back to me as soon as they respond enthusiastically that they are anxious to perform your masterpiece. Actually what will happen is your score will go into a slush pile and sit there for about a decade, untouched, before the janitor throws it away.
Unless you happen to have a philharmonic waiting for you in an outbuilding on your estate, ready to record at a moment's notice. I'm eager to hear the results of your test. Be sure and post it soon!