[tnzm]

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.

[colordrops]

It's not arbitrary. "Other causative factors" is boundless.

[tnzm]

You now seem to be talking about something else entirely.