I never used SCCS, I got on the bus at the RCS stop.
And I spent a few years early in my career pleading arguing, yelling at people to get them to use something, anything other than 'copy your latest files into this shared directory.'
The strangest SCM task I did was when the CTO said to refactor a bunch of Java classes, but keep the revision history. It was 2000. At that company, we used CVS, which doesn't keep revision history when you move a file. So I had to go into the repository itself and physically move files around. 😱
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It's no big deal. It works fine. In fact, for this purpose it's simpler than git.
I've used many SCM's all the way back to SCCS.
And I spent a few years early in my career pleading arguing, yelling at people to get them to use something, anything other than 'copy your latest files into this shared directory.'