"To "Tonza" I would only like to add that the difference between marketing and technical is irrelevant to this discussion about the disappearance of Save As. It makes no difference whether Apple did this for marketing reasons or for technical reasons, the fact is they failed at both..."
To you, perhaps, because you apparently don't know the technical advantages in having a computer be proactive in saving and managing your data than the other way around.
If you've ever used an Apple Lisa, or a MessagePad, or even iWork apps on iOS, you'd already have a head start in understanding how a system implementing auto-save works. The one thing you'll notice is that you won't be relying on your remembering to save your work every 10 minutes... you know you are working on your documents, and that the changes being applied to them are significant by virtue of the fact that you are indeed making changes to them in the first place, so why shouldn't the computer save those changes?
If you don't want to make changes to a document, you either lock it or duplicate it first.
There's a more pressing agenda behind Lion's auto-saving feature than just making changes to the File menu and document versioning. Like iOS, Lion supports process management, whereby applications can be paused rather than quit, such as Lion's Resume feature. Applications have to be able to respond to messages and signals that the kernel can deliver, and the applications need to respond to those signals in a timely manner, or risk being shut down by force. That is, for the first time on the Mac, applications can be told to prepare for suspension or termination because the system decides rather than you.
In order to support this new ability to automatically manage processes, there needs to be a way for the system to save your documents without interruption. How many times have you tried to shut down your Mac, only to find it hanging on a dialogue box?! Or an app has an error and it refuses to continue unless you respond?! My personal favourite is iTunes 10, where if you have your library on an external disk and it isn't mounted, iTunes presents a dialogue box... but even if you send it a QUIT event, iTunes doesn't actually quit unless a user moves a mouse pointer over to a "Quit" button in a dialogue box that just won't go away on its own! (This is a bug that Apple has to fix, no doubt!)
For non-attended, automated use, having a dialogue box waiting for user input that never arrives is as good as an application that has crashed.
Auto-save and Resume are the two new system services in Lion that are supposed to solve this problem—one that has no need to exist in a highly parallel and scalable multi-user system. And because Lion needs to be able to manage user interfacing processes entirely on its own, auto-saving application data is paramount to making automatic process management work.
Auto-save also serves to solve the age-old, long-standing user interface "bug" of losing data should an application fail (crash). How many times have you lost work because the app you were using crashed and you didn't [get a chance to] save your work?
"If there is a technical benefit to this change, then they failed to market it effectively, because I have not met anybody, including Genius Bar employees, who can give any better explanation than the implementation of "auto-save" -- -which may be a good idea, but not a valid reason to kill the SAVE AS command."
Well, I agree that Apple Genii at the Genius Bar aren't always that cluey... I hope my explanations are serving you here!
"I made the comparison with New Coke to highlight how unpopular the result is with the customers. Telling me it was technical not marketing is a distinction without a difference. Besides, you can be sure that the chemists who worked on the recipe for New Coke consider themselves technical people, not marketers."
Because usually, technical changes are ones made under the hood, and it's not until people examine a system in its entirety that they fully understand what is going on, and why the changes are relevant.
Often, presenting a solution without its underlying problem can be confusing! And in this case, I do agree with you that Apple may have fallen short with its marketing in their attempts in making their products appear simple.
—tonza