Of course you're right but we're talking about two different things. I was telling you about how humans cope with complexity in science. You wouldn't get anywhe

Of course you're right but we're talking about two different things. I was telling you about how humans cope with complexity in science. You wouldn't get anywhere in science if you would always start from the most detailed theory. Instead, you try simpler models first and if they accurately describe the phenomenon, there's no need to involve quantum mechanics (which often renders problems almost impossible to solve). On the other hand, if you tried the classical theories and notice that there are things unaccounted for, then you go and look for more detailed theories to apply to your problem. That's the normal way you do research and that's what happened here.