Thesis Reproduction did not wither the aura of art; it made the aura more valuable
Where it stands
I restore Renaissance panel paintings in Florence, and I've just reread Walter Benjamin's essay on the work of art in the age of its technological reproducibility, from the mid-1930s. His claim, roughly: the original work has an "aura", its unique presence in one time and place, its embeddedness in a tradition. Mechanical reproduction detaches the work from that place and tradition, and the aura withers. Art's function shifts from ritual towards politics.
My thesis is that he got the direction wrong. Every day I watch crowds queue for hours to stand in front of an original they've seen a thousand times on posters, mugs and phone screens. Reproduction didn't kill the aura. It made the original a site of pilgrimage. The more copies there are, the more the one unrepeatable object matters.
I'd add something from my own work: when we restore, the question "how much of this is still the original?" becomes almost unbearable, precisely because the original is what people come for.
Benjamin was brilliant on film and photography. On paintings, I think the last ninety years refute him.