We were made in His image and likeness, endowed with free will and reasoning ability.
Because we are endowed with free will and reason and given God’s laws, we need the ability to use our reasoning based on our own experiences as well as observation of other’s experiences to make the choice to follow God’s laws.
As a parent, I would be extremely gratified if my children blindly accepted my ethical teachings but used their God given intellect and reasoning to become great doctors, scientists, writers or whatever have you. However, they will at points have to use their reasoning when faced with moral and ethical choices in the course of their work, never mind outside of it.
Without reason and intellect we would not be images of God; we could not have dominion over the earth and animals; we would not have the ability to search for God through science, prayer, etc. In other words, without free will and reasoning there would have been no point for mankind.