When full empiricism seems to have a foothold and more is sought (no compromises sought) then in the psychological, biological and the social : the Age of Reason may begin .
I worshiped Piaget for 3 decades. But, more recently, I determined that his "theory" is not fully empirical , but just descriptive (points to/towards NO proximate causes). My neo-Piagetian theory is fully empirical and does point at proximate causes.
Something is not empirical to me unless it is fully (aka really) empirical