No. It's not about whether there was "a lot" more. It's about how much it can add on top of "nature vs. nurture" to explain common social phenomena. It is very possible the new knowledge can be 100 times more complicated, but it only adds 1% more explanation power to everyday phenomena.

Take physics as an example, quantum physics has "a lot" more than classical physics, but no physicists will discard classical physics as being no longer valid, or no longer useful for explaining everyday physical world, or you should always use quantum physics in engineering, etc.