It doesn't lack those voiced lines because of some purposeful artistic goal.
All art is a compromise between artistic vision and economic reality.
If the concept of art one has in mind limits creative endeavour and acts as a gatekeeper to art, then it is probably better not to have a concept of art at all.
I'm glad I'll never find out how much fun, skill gain and artful cultural production I might have missed if I had carried a false, limiting idea of art back then.