I don't see a benefit of setting many apps to unrestricted. If I understand correctly the difference between "unrestricted", "optimized" and "restricted" when I read those setting options, an app that is set to "optimized" isn't necessarily going to be restricted as such will be determined/suggested by the device after a while and as Vid indicated, as part of the lists of "never", "sleeping" or "deep sleeping" apps, lists that one can also manually edit when the device presents its suggestions. For me, I think I have a preference for almost all apps to be "deep sleeping" so they do not ever try to do things on their own in the background that I didn't initiate by actually using or opening the app. For me, I do want some specific apps to be able to do periodic checking and processing on their own, such as Calendar, Email and some very limited social media feed-like apps. In my settings, those all show as "optimized" and then not as "deep sleeping". I also periodically check for what apps might once and a while show-up as "sleeping", and then normally move those to either "deep" or "never". If I could, I'd use the same concept for trying to control app usage of mobile data and wifi.