It's a generalisation. Of course it isn't 100% accurate but it's a good predictor. It's much the same as "code stored in BZR or SVN probably isn't worth the pain of trying to get it out of its antiquated version control system to look at it" — there are exceptions, but they are few.Am I the only one who remembers digging around in sccs archives while dealing with "the new hotness" that was RCS?
These "ancient" vcs systems didn't exist when I got started.
(Previously.)
