> there's tens of millenia worth of reasons why they are the way they are. Eh, not quite: all of these "reasons" are adaptations to a specific condition. Many

> there's tens of millenia worth of reasons why they are the way they are. Eh, not quite: all of these "reasons" are adaptations to a specific condition. Many of which only exist since recently (for example, reinforced concrete enforces certain adaptations). Evolution is not working towards one static best solution. It is always a process of adaptation of an existing solution to the current context.