Cut hairs have a cut end, they do feel thicker, the cut end feels stubbly and rough, but it's exactly the same hair from the same follicle.

Shaving hair does NOTcause more hair to grow, otherwise balding men would just shave their heads and grow new hairs. They don't do they. It wouldn't work.

Hairs grow from follicles. the follicle determines the growth rate and texture, it also decides on terminal length and curl and colour.

You cannot make hair thicker or coarser by shaving. It is a matter of sensory perception. You think it is, It is not. Sorry