The "what good is beauty" question is interesting. It is at the heart of Matthew's critique of evolution as explanation (https://medium.com/@doyouthinkihaveforgotten/is-evolution-a-sufficient-explanatory-principle-479918be7477).

My reply to him addresses the human appreciation of scenery, which is something like our appreciation of sunset : https://medium.com/@quasimodo/you-can-actually-get-there-using-evolution-by-way-of-the-advantages-that-come-from-being-curious-0b3ccca1affe