Since updating to Numbers 5.3, it no longer autosaves. After a problem caused by a video fault, I lost 5 hours worth of work - Numbers also didn't autosave. I contacted Apple support via webchat, and you can see the conversation attached.
Sounds like they're getting ready to merge the phone and mac versions.
Pages took a serious hit when they moved the Mac OS and iOS towards compatibility.
I Don't see the benefit of having Apps that can't do what you want, across a range of machine types.
But perhaps Apple is all wise and all knowing.