You don't need to fully understand the brain anymore to create advanced AI. Recent advancements in machine learning have made it possible to develop useful AI without deep knowledge of neuroscience.
Just knowing things isn't enough; building and creating is important too. The academic world focuses too much on understanding without encouraging actual creation, which feels unfulfilling for some people.
Academic culture often discourages ambition, leading to a focus on small, safe projects rather than bold, innovative research. This can make talented individuals feel stuck and unmotivated.