I do believe that electronic usage can be both abused and neglected, with significant negative consequences for both, and achieving moderation is key. Being overly restrictive can sometimes backfire, too... forbidden fruit.
I generally do not police my DD's usage because she self-regulates well. She's very outgoing and active, and those forces pull her away from the electronics after more than an hour. She sometimes has friends over who want to watch TV or play Minecraft all day, and after a while she loses her patience with them and drives them outside. Naturally, we monitor this balance, we commend her when she's doing well, and we send her off to do something active on the occasions where she gets out of whack.
Each parent has to regulate it as appropriate for their own child's nature.
