That line of thinking is surprisingly common—I've been calling it the 'Appeal to Nature Mystique'. The notion of "what's natural" is little more than a kind of silly religious superstition IMO.
FWIW, I'd a
transhumanist-related argument in the recent immortality thread w/ Esaman (who self-types LII); he was using a similar line of argument as the one you described.
I'm ambivalent to arguing for/against the ethics of 'transhumanism'. The proliferation of technological means to modify/enhance the human condition is inevitable.