Here's why:

* Chief cells are responsible for producing pepsinogen, the inactive precursor of the digestive enzyme pepsin. Their shape is cuboidal (cube-like), with a central nucleus and granular cytoplasm.

* Squamous epithelium is a type of epithelial tissue consisting of thin, flat cells. It is found in areas where diffusion or filtration is necessary, like the lining of blood vessels or the alveoli in the lungs.

Therefore, it's important to distinguish between different types of epithelial cells and their functions. While both chief cells and squamous epithelium are part of the epithelial tissue, they have different shapes, locations, and functions.