[FD3SA]

> There won't be much difference beyond reproductive roles and other physical traits, but the brain doesn't seem to be affected all that much, no.

Ah so evolution stops at the neck! Genius!

The more you know...

[norea-armozel]

Evolution stops specializing when said specialization offers no beneficial adaptation sufficient for the metabolic cost. It's why the vast majority of living organisms have much simpler brains, body plans, and even reproductive strategies. Humans and other similar animals are rare little things in the vast ocean of simpler, more elegant mutations.