I echo your sentiment in these regards. It is much easier to do certain tasks in Control Panel (Networking and Power Options being the two biggest examples of this in my opinion), while other things are easier in Settings.

I think the real problem is that Microsoft hasn't place enough focus on getting the Settings app correct from a UI/UX perspective like Apple did with their Settings app. There's nothing technical preventing them from offering a streamlined experience in Settings that allows you to easily configure advanced settings when necessary. It's just design effort on their part.

If they can get their Settings app to the point where nobody wants to use Control Panel anymore, then that's the right time to deprecate it.