Re: WTF?
"WhatsApp will happily ensure that end-to-end encryption works properly."
Sure. The trick is in remembering exactly where those ends are. For those not paying attention, the ends are Whatsapp. They have full access to everything you say and do on their app. End-to-end encryption means third parties can't spy on your messages while in transit, it doesn't mean no-one else ever has access to them.