Reductionism is a theoretical framework. It is neither right nor wrong, Sometimes a theory based on reductionism is wrong, but reductionism it self is never wrong.

Reductionism usually includes interactions of the lower parts (unless you are an atomist; in which case go back to ancient Greece), I never denied this. However even with the interactions, reductionism is still a lacking framework to describe consciousness. If it wasn’t so lacking it would be more popular among the people who actually study the mind.