Is AppStorage reliable?

I was/am considering using it for some app preference settings so for each instance of my app these can be unique and saved.

My app is a editor and so that would equate be things like navagator sidebar format (font, size, weight, color, etc), inspector (righrt sidebar) would have it's own formating, Default settings for the editor.

This has two potential issues. 1. ALL books would have the same settings. 2. Moving the app to another machine requires I carry around the preferences, and 3. Shared/collaborative authors would have to sync the formating preferences (or not - depending on what they want).

So, is it reliable? Meaning. If my Mac goes to the great recycle bin in the sky, will my new mac KNOW the preferences, or do I need to provide a method to bring them along?

The other option is to provide a preferences model struture that the document updates on a per book basis, and that would get persistance, potability, and sharing solution all at once.

If my "thoughts" above are true, then I wonder why have AppStorage? If you need persistence in an APP, why not just use it for anything that has to survive relaunch, sharing, colaboration, and moving to another machine.

Suggestions? Thoughts?