Hum... how is that a problem ?
It's a problem because when I open and modify a document, purposefully or accidentally, I don't always want to save those changes.
The system now insists that I save any changes that are made to a document. Sure, Apple implemented document locking to cover up this problem with
older files, but they left new files vulnerable. Heck, you can even set document locking back to a year after last changed in Time Machine prefs. Ever wonder why you can't turn off locking easily? This is why. It'll leave your files open to automatic changes every time they're opened as documents.
That's a year during which your files are open to corruption by the simple process of moving, not copying, the file to between hard drives. As we should all know, versions don't live through that process.
IMHO, this is not a feature, it's a bug, and one we didn't have before Apple enforced autosave.
Maybe your files aren't important enough to care about such things, but mine are.
Shiny-newness aside, the new system does not protect file content as well as the old.
Spend a little time trying to understand why autosave didn't become universal in the 80's. It's always been easy to implement on a Mac. A journalling file system covers up some of the problems for autosave, but as currently implemented it's an inadequate substitute for user intent and action.