Art for life sake

I don't believe in the idea of art for art sake because even from the time man was not able to read and write it used symbols (which again is a kind of art form) for their required purposes . Art for art sake is a myth as u said sir but i would like to add that u told art for art sake is a myth for architecture but i believe it's true to all forms of art that man has ever discovered so i strongly favour art for life sake