to what purpose?

i’m sure there is a purpose to the micro variations of these succulents, and of course they are succulents in response to the dry climates where they evolved, but why exactly  that shade of cranberry and that other shade of dusty celery? why exactly that needle-tipped leaf vs. that lance shaped one? did these all evolve to be beautiful, or did we evolve to find them so?

collection of colorful palm-sized succulents