Been there. There was this old fashioned developer in one of the companies I worked for a decade ago who never understood nor embraced version control (we were talking of SVN at the time, not even git). Luckily that wasn't the case for all the others developers in the company. But when it came to the projects he owned, I witnessed several scenes along the lines of "hey, customer X has an issue with your component Y, what version do they have?"
He had a spreadsheet where he kept track of the versions used by every customer. Once identified the version, he would open (no joke) a drawer in his desk and pick the right USB stick with that version on it.
I've always wondered whether this overhead was a worth price to pay for not wanting to learn a couple of SVN commands.
