Good idea.

Making thinking visible, by your suggested "why do I actually think that" monologs, would also help with transfer of useful evidence-gathering or reasoning tricks, so that if e.g. you and I are talking, and you did something useful that I don't know how to do in coming to a particular conclusion, I can see how it worked and maybe copy your trick in general.

I know math/science tutoring works better when people spell out more of their thinking than is common.