Who's making that idiotic advice???? I've not seen it anywhere, especially for something easily correct with either a hard reset, or a restore. Why do something so silly when only a small minority of 400 million iOS users are even reporting a problem and those that have solve it by doing one of those two simple things????
I agree it’s idiotic advice. Google iOS “7.1 battery drain” and you’ll see several articles about it being the most notable addition with the upgrade. Our phones have all been affected. My iPhone 5 most notably. It’s gone from 24 hrs on a charge to less than 6.
A hard reset is usually the fix all, and it it simple, and quick. Restore is a PITA and time consuming, and unless you are restoring to a previous iOS will probably not fix the issue.