Yes, but they didn't have art schools, museums, supplies and they didn't doodle in boring classes or meetings. They didn't have an "art tradition" - or at least not in the way we do now - they had invented it themselves.

If Rembrandt, Raphael or Warhol were born back then they wouldn't have had the cultural milieu to create the same things.

Funny anecdote, that when Picasso visited these places in southern France, he said: we have learned nothing.

Or something similar. Compare it with his style when he got older. It's related.