Regarding wasted time, you miss the point, Koenig:
Neither you nor I would waste any time at all if the menu commands that we learned how to use in 1984 were not suddenly changed, and without any explanation for what new series of menu commands has replaced them, why, and what the alleged benefits are.
I have learned that the basis for these changes is to make auto-save behave like Time Machine, allowing each and every document to have its own history. I don't doubt that for some users and for some applications/documents, that could be a benefit. I simply don't agree that it is a one-size fits all solution for all users and all documents created by the app in question, whichever it is.
When some software apps offer new menus or workspace features in a new version, they allow the user to upgrade but continue to use the old familiar tools until/unless they are ready to advance.
What Apple might have considered is a Preference that turns auto-save on/off and to preserve the Save As command for those who want to use it. My point is that the engineers shove these things down our throats without the real-world experience of the users.
Moreover, in a workplace, a supervisor bears the burden of lost productivity, confusion, and errors caused by numerous users -- or incurs the cost of re-training everybody, with no apparent benefit.