Another aspect of your approach is reductionism. You treat low level theories are more important. We consider that a mistake. There's nothing wrong with emergent properties. There is nothing wrong with arguing from a higher level idea to a lower level one. Higher level ideas are just as valid as any others.

No, that's incorrect. That may be how other philosophers use the term, but that's not what it means here.

Edit: To clarify, I mean that LessWrong doesn't define reductionism the same way you just did, so your argument doesn't apply.