"Even the Tree of Life is susceptible to reification that way."

This. It's a human diagram, after all.

"materialists and idealists mistake their models for the reality they describe"

I can imagine. Though I would add that it's just lack of rigor. Materialists try to ignore the "descendant" motion, idealists the "ascendant." Despite plenty of (also scientific!) evidence for both.

"Castaneda diagram, as of the three presented it best points out that we cannot reason our way to direct knowledge"

I appreciate it for its implied humanistic practicality. Compared to others, however, it puts too little emphasis on the unknowable or how it relates to the rest. I mean, knowing the unknowable is the "goal" in the end.