Bam, copied human.
Likewise, if the new job of a game writer is to develop the "persona" of a video game character rather than write the character's dialogue, what if someone just dropped the video game angle and described themselves in excruciating detail and included all of their writings in the input?
You could copy yourself, just like that childhood diary blogger did.
The true long term opportunity here is making a sufficiently competent model and then creating personas from influential people alive today to solve problems beyond their immediate area and lifetime.
The long term cost of knowledge work is going to become 0 as our supply of intelligence becomes unbounded by number of brains on earth :)
What you describe is a propaganda officer for every human mind.
Layer onto that the question of if the model is actually "perfect" or just telling you that it's perfect and integrating the mistakes ad-hoc. What if the model decided that you were secretly trans, even if you didn't feel like it?