This was essentially unavoidable given how the printing industry works and how game development works (games are tweaked to the last minute, and printed material needs to be finalized into a printing copy roughly 6-8 weeks before they are shipped).
That is a false statement. I have plenty of manuals that still are valid for my games.
Usually the game devs know what they are doing some time before the game release and print of the manuals. I really doubt that many other developers have no idea how their system should work day before the release.
Printed manuals, for games published in the last couple of years, where development continued up until the last days?
If so, that's some lazy-ass developers right there.