Since this is not a problem with the program proven multiple times a day by thousands of users and it has happened to you across multiple versions and multiple computers, what's the common denominator?
First of all I like to know whether or not you audit or fix your error message. This contributes 90% of the errors and crashes. If you cannot fix that and expect Revit to function properly without issue, then it is your own fault for not maintaining it or fix the issue at hand. It is like a car and you expect to maintain it to make it run smoothly. You don't expect software to maintain it for you when you refuse to fix the little things first. Once that little things you put off become a huge heap, no wonder you lose work as a result.
Also even if you have autosaved, it won't do you any good because Revit worksharing model can be huge and expect that to saved every 5 mins will no doubt tax on the network system. You have to properly maintain the model from error fixing to even reduce the over modeling within your project. This is where BIM manager is needed to keep the project run smoothly. If company is too cheap to do this and expect people to run straight like CAD, they are asking for issues.
I think you're making some assumptions that might not be true. It's impossible to ascertain the OPs working environment from such an unfounded complaint. For all we know it could be any number of things causing the saves to not happen. They might be happening and the OP doesn't know the actual location. I expect it to be something procedural as they mention walking away from a model without saving. It kinda screams some naivete. I doubt we will ever find out as these kind of posts hardly ever get followed up with any real details about the workflow and computer environment.
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