About the save system - it’s not meant as a fully working solution straight out of the box, it’s basically a demo to show how you might save a character, what variables need to be saved and so on. You’ll have to design a save system based on your own criteria if you want functionality beyond that.
I don’t think it’s realistic to make a save system that’s flexible enough to apply to all possible circumstances with regards to NPCs, networking etc, and attempting to would probably make it very convoluted and harder for users to dissect.