Re: "To provide a better experience to customers"
This is why you don't send in an engineer to do a designer's job. They throttled the processor speed in order to prevent the phones from shutting down even with a full battery. It's far worse for the user experience if your phone dies without warning than if its a tad slower. Think like a user not a benchmarker. Clock speeds don't matter when the phone is off.
That said, I think they should have let everyone know about the issue and offer a battery replacement at a reduced rate.