[medoc]

This is true but it was certainly not considered good practise even at the time. I've been on the seller part of a few software companies acquisitions from the early nineties, and checking what kind of source control we were using and how was part of every audit. A long history of sccs -> cvs -> subversion ->mercurial or git...

[eru]

Yes, though eg Linus Torvalds famously said that them mailing around tar-balls was better than CVS.