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Just like with Android 4 vs Android 2, they should enable wireless connection by push; meaning, as long as no app requires data, leave it off.
Android 2.3 had horrible battery life, when the GPS was enabled.
In Android 4 and later, you can leave the GPS enabled, and it won't change battery life, unless an app uses the GPS data (If you load Google maps, for instance).
When the GPS signal was off, you could load Google maps, without background battery drain.
I think in a similar way, wifi and cellular network only need to access when you're on a browser, or downloading a book.
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