Why respiratory passage isn't the primary function?

Can somebody explain the reason?

Why respiratory passage isn’t the primary function?

The most primitive action of the larynx as seen in lungfish was as a muscular sphincter to prevent the ingress of water into the respiratory tract and is hence considered the primary function of larynx.

Next evolved was the function of the maintains the patency of respiratory tract as in salamander.

Latest in evolution was its phonatory function

wow! Thank you so much Ma’am