This is incorrect. Not only did humans used to work significantly less and we (the working class, anyway) in the past few centuries have less leisure time than ever, but if anything, the introduction of what you consider “civilisation”, and especially class and money, harmed art more than anything by giving the power and control over it to those who aren’t creating it, and leaving those who are, starving, like the rest of the plebs, or completely undiscovered due to lack of privilege, opportunity, and access.
Every single one of them is telling on themselves.
LISTEN
https://theanarchistlibrary.org/library/romeo-kokriatski-respectability-politics-or-you-gotta-be-nice-to-monsters