I don’t think you understand what “the engine supports saving at any time” entails.

Having the ability to serialise objects is not the same as handling the input and output of serialisation.

You might as well be annoyed by why aren’t all developers letting us rewind time in games? Load from our last save? No thanks. Developers are so disrespectful of my time. You just need to log all the changes that happen and play them backwards. Every engine supports that.