Were there really that many comments that needed censoring? It would be nice to have the idealism to think of Sun as a freewheeling, uncensored alternative to the corporate structure of DEC and IBM, but having seen the "released" source for the early '90s Unix operating systems of all three I never saw anything to indicate that there were censored inline curses anywhere. If anything, the DEC sources are now more informational by virtue of still having a mostly complete changelog in the header.
-Henry