I'd never be outraged by an artist utilising something manufactured, even if it was the last surviving example. It would be provocative but then art that carries a message must often be provocative to get it's message heard.
It was Carl Andre's work Equivalent at the Tate in the 70s that was a turning point in art appreciation for me and many others. The focus on an everyday object required a leap of perception to divorce it from its mundane reality - my world view completely changed at a time when I was coming to terms with myself not really fitting into society (What's changed

). It certainly has had an impact on my glass collecting as I can enjoy a piece of gauge glass

as equally as I enjoyed the Vincent Ysart vase

. For me each has its own intrinsic meaning yet neither are works of art but the output of a factory - yes one was mass produced and the other unique but in a world view, the mass produced touches more lives whereas the unique is probably known to a few thousand people. Likewise in art, "Equivalent" became one of the best known pieces of art in the Tate gallery.
I too was impressed by Neil Roberts work.