This is a crazy discussion, although I'll confess that I haven't read it all. If you go to an exhibition of Cartier Bresson's photos, what size do you expect them to be? 10 x 8? Of course not.They'll be 20 x 16, despite the famously poor negative quality. But they look terrific, because the photo itself a rich print are everything.
I have been to an exhibit of CB. Print sizes ranged from considerable smaller than 8x10 printed on 8x10 paper up to perhaps 16x20. Most were probably about 11x14.