That is an interesting way to categorize those functions of the brain, but philosophically, doesn't this leave us in the same place? Whether you classify it as ancient/modern, or subconscious/conscious, we're still talking about two modes.
In one of these modes we actively perceive/experience our concept of reality, and the other acts as a black box - not available for direct interrogation, but still possible to reason about via observations in conscious experience.
The issue I'm having with this take is that our definition of reasoning still depends on the black box. The experience of feeling like a being capable of reasoning and then using that ability to consider a problem is all built on a foundation of thoughts, sensations and feelings that just "appear" in conscious experience with very little evidence that the conscious mind had anything to do with putting them there.
In one of these modes we actively perceive/experience our concept of reality, and the other acts as a black box - not available for direct interrogation, but still possible to reason about via observations in conscious experience.
The issue I'm having with this take is that our definition of reasoning still depends on the black box. The experience of feeling like a being capable of reasoning and then using that ability to consider a problem is all built on a foundation of thoughts, sensations and feelings that just "appear" in conscious experience with very little evidence that the conscious mind had anything to do with putting them there.