you say, you where trying to use swiftUI and MVVM for 3 years without success. my suggestion, why: MVVM isnt an architecture.but so isnt your proposed solution.

Of course you can name your stuff, as you see fit. but if you want your readers to follow you, you should keep conventions. a store is storing stuff. it does not process them, request them or handle them in any other way. What you have here is a good ol' God class.

As you allwow for hidden global mutable state your tests have little significance.