i don't know why trying to simulate the brain is so popular when there is a conversation about how to archive AI. Most of our current achievement were inspired

i don't know why trying to simulate the brain is so popular when there is a conversation about how to archive AI. Most of our current achievement were inspired by nature but then separated to better exploit the different tools we have to achieve said thing. E.g. the plane: Most of the initial designs were heavily inspired by birds but over time the similarity decreased and not increased. We now have jet-engines and no reason for mechanical movement of our wings. I am generalising a bit, but what if something similar happens to AI? Maybe we will achieve general AI, or just something very smart, that is very different from our brain.