The art world has always been about novelty, but what was considered novelty centuries ago is now considered as "classic". There are countless examples of artis

The art world has always been about novelty, but what was considered novelty centuries ago is now considered as "classic". There are countless examples of artists that didn’t get much recognition because what they did was too "modern" for the times they lived in (see Caravaggio for example). Most of the things you see in museums are notorious because they were extraordinarily novel for their time, not because they would be hard to reproduce.