I never said it's not useful, only that in this circumstance it's not important. It may be that he would eventually gain some efficiency by learning and using v

I never said it's not useful, only that in this circumstance it's not important. It may be that he would eventually gain some efficiency by learning and using version control, but the lack of version control has clearly not prevented him from successfully creating a program, and quite a complicated one at that. Even huge projects involving large numbers of people can be and have been done without version control, if you have a large enough project management staff. You'd be mad to try to do it that way merely because you can, now that version control has gotten so good, but it's still not a necessity. It's not vital.