Imagine a shower surface that doesn't have grout joints to fail or become stained by mold and mildew. Solid surface is the solution.
How about a matching vanity top?
How about built in window treatments or a soap caddy?
By fusing the seams the shower wall becomes a continuous and flat surface that is very easy to keep clean.
Tub decks and skirts can be done with acrylic solid surface. As you can see, this is a very clean and stream lined installation. Nothing here to de laminate, stain or swell due to daily use around a wet environment.