The emergence of technologically capable species seems to be a low-probability event. Considering the vastness of the universe, it has probably occurred countless times.

On this planet, hands are more common than imaginative brains; most primates have them.

Human hands are unique in two ways.

Human hands are capable of unusually fine manipulation due to the large and complex neurological network operating between the brain and hand.

Human bipedalism leaves the hands free to carry items over long distances. It would make no sense to spend significant time and effort to knap sophisticated tools from flint and obsidian if they had to be left behind.

Imaginative brains, the capacity for fine manipulation, and bipedalism operating in a coordinated fashion are the characteristics that are necessary for technological development to occur.