This could have been written and 2014 and 2004 (hi, it's me). There will always be people who don't use it and others who won't remember a time when they hadn't used it :P
Hello, fellow old person. I was just remembering PVCS (Polytron Version Control System) since it was the first I worked with back in the 80s. Now I see that it's still out there, with the latest release in 2021. Which is insane.
By 1994 I had moved to other companies and a NeXT equivalent to svn with a good GUI - and then ClearCase.