A nice short definition of Epistemological Essentialism:
“Epistemological Essentialism is the view that all entities have intrinsic properties that can be discerned by reason”
“All entities have intrinsic properties”.
So, reasoning it through: Would free will be an entity or a property?
What about reason: Is reason an entity or a property?
When I think about the notion of epistemological essentialism, this comes to mind: It’s an ontological stance but when it’s placed in the realm of epistemology, and then made into an essentialist form, the parts always and only be utilized for these functions in this way for that is intrinsic to their nature.