One thing only lightly hinted on is how sccs was designed to tightly couple the source files to the output object files. Imagine super fine grain symbol version

One thing only lightly hinted on is how sccs was designed to tightly couple the source files to the output object files. Imagine super fine grain symbol versioning + loads of metadata for large project management tools. There was also stuff related to version constraints, security, and dynamic dispatching. They had a very different definition of "source control". I still see some odd artifacts of it pop up every so often in AIX object files.