Because human reasoning can understand what repenting means.
Instead?
What if...God said? .... I said that to you to scare the hell out of you, so you would change the course you were taking.
And, I always knew you would change.
So.. To make you feel like you have a sense of control over your own life? I said. "I repented."
God does not want to drive frail humanity insane with too much information they can not handle.
You need proof?
Just look at the Calvinists!