I think something a lot of commenters are missing is that people who have worked like this for a long time are often massively resistant to using source control

I think something a lot of commenters are missing is that people who have worked like this for a long time are often massively resistant to using source control, even after having it explained to them. Even getting that process to stick properly ("Step 1") will be a challenge, never mind resolving the other 10 complaints in OP's list.