Accidental complexity is an academic term, it means what you refer to as "complicated." Essential complexity would be what you refer to as "complexity." My comm

Accidental complexity is an academic term, it means what you refer to as "complicated." Essential complexity would be what you refer to as "complexity." My comment was being precise about it. dyn is avoided because it is typically slower due to the indirection, and because of how its opacity breaks many zero cost abstractions.