Hormone Cascade Pathway

Hi everyone,

I was hoping someone could explain why hormone cascade pathways exist the way they do? For example, why does the hypothalamus release Thyrotropin-Releasing Hormone (TRH) to stimulate the anterior pituitary, which then releases Thyroid-Stimulating Hormone (TSH) to stimulate the Thyroid, which then releases hormones itself. Why doesn't the hypothalamus just stimulate the Thyroid directly?What is the point of the anterior pituitary? Given that the hypothalamus is the organ responsible for linking the nervous system to the endocrine system, it seems reasonable for the hypothalamus to directly stimulate other endocrine glands around the body. I can't understand the reason for relaying all the information first to the anterior pituitary.

Any help or input is much appreciated as always!