If I am understanding correctly you are saying that one shortcoming of lab experiments is that you cannot have as wide a variety of enviromnental conditions to test mutations in as occures naturally in the wild.
That's part of it.
My father used to say "the wheels of time grind slowly, but they grind exceeding fine." What we do in our labs won't "grind" as finely.
What does IC stand for?
Sorry about that. It's short for "irreducible complexity", a term that Behe used, and has since been picked up by creationists and ID proponents. (ID = Intelligent Design; just playing it safe and defining my acronyms). According to Behe, evolution cannot create irreducible complexity.
Also, you sound a little self concious about the possibility of making a mistake.
Not really self-conscious. I sometimes write with what seems to be an authoritative tone, and I didn't want to mislead people into thinking I had any expertise.