Imagine.... if one day... people could no longer see. What would happen to the concept of "beauty"? Would it after a while be defined by scent? Of course sounds can be beautiful, but I´m talking of visual beauty. Perhaps it is worth a try. If one can´t see beauty, one doesn´t feel pain. With the exception of physical pain of course.
Or is it actually like that? Perhaps not entirely, but beauty is a cruel concept that has a main function of hurting people. People generate affections to beautiful things and people, and feel pain when those beautiful thing are lost.
But no.... not all mental pain would be lost. Beauty doesn´t create all of it. Most likely not even by a long shot. But beauty, in the end, creates only pain. At least in this world with these morals to live by.
If all beauty would be gone and enough generations would pass, so no one anymore knows of anything beautiful, I suggest that people would be much happier with great many less cares and sorrow... wouldn´t that be a sight?