A lot of the best photographers didn't print their own work. Karsh had a great printer on staff, while other's used custom printers at labs. They still had a lot of interest and input in how the printing was done.
A few of the great photographers did print their own work, and were not the best at it. If you see prints by Eisenstaedt you'll see a great image, but an average print and many of them went un-spotted. I still love his work by the way, it's just the prints that were wanting.