There's a great documentary called "A Decade Under the Influence" which details the decade after the studio system collapsed and before the rise of the big budget blockbusters.
"Easy Rider", "A Woman Under the Influence" and other works by Cassavetes, etc. brought the European art film aesthetic to America.
Yes, some of these movies were meandering and self-absorbed, but many were great works of art.
It's more than I can say for any superhero movie of the last four decades. They may have advanced CGI and special effects, but that's about it.
A Decade Under the Influence" sounds like a good one!
Do you think Rosemary's Baby was an example of the "European art film aesthetic" ?