Saying "there is no essential difference between genetics and other causative factors" is arbitrarily different from saying "all is one, separateness is an illusion". That is, it differs in connotations and not in the essential content of the statement.
Which is exactly what you said, except that you chose to ignore that connotations conduct meaning, when you asked your rhetorical question. This is not e-prime, it is a plain old adverb answering the question "how?" like adverbs normally do.
No, I'm not. Can you be more precise in what you mean by "causative factors"? Without further context, and based on my understanding of the world, virtually anything internal or external to a person could cause them to be more or less skilled at something. It contains everything, and so seems that your statement could be interpreted that genetics and everything else in existence are one in the same.