This seems like the subject part of RxSwift/Combine without any of the useful parts. For example, the networking example requires an explicit property whereas t

This seems like the subject part of RxSwift/Combine without any of the useful parts. For example, the networking example requires an explicit property whereas the code I would use for something like this would be to return an Observable directly. For most use cases, you don't have to handle state separately. Basically, this seems more complicated than using something like callbacks with this only having some very edge case benefits to that.