If you explore it on google long enough, you eventually come to a study a
physicist-turned-biologist conducted.
we have 4 types of mechanoreceptors in our fingertips that we use when we touch things and the objectively best one of these four, the Pacinian corpuscles (which occur about 2 millimeters below the surface of the skin in fingertips,) are in charge of mediating any fine textures we touch and are exactly sensitive to any vibrations around ~200 hz.
And the ridges and valleys of our fingertips are precisely designed to enhance that vibrations of that range, increasing our tactile sensitivity 3x over. (Which could be the difference between feeling which fruits would be safe to eat and which would be rotten for early humans etc)