Is it best to stay off electronics when you have free time, or not?

Neither yes nor no. If you have the freetime what you do with it is up to you. However I personally think that using electronics either for browsing, gaming, etc should be moderated or limited. IMHO no more than 2 hours a day for someone around 16 and less for under 12s. An adult who uses their devices for more than 4 hours a day in their freetime (if it's not for a hobby, like drawing, music) might have an addiction problem.