In the Orwell classic Animal Farm there was a binary notion that the animals lived by – “four legs good, two legs bad”. This eventually morphed into “four legs good, two legs better” as the pigs who became the lead animals began walking on two legs like the evil farmer they had replaced.
Binary thinking has a role in areas like engineering where unless a bridge or building is a certain strength it may fall down. However human biology is not quite as amenable to this approach. Notwithstanding that we are all similar, no two people (even identical twins) are exactly the same.