I have no direct involvement with Facebook. Nevertheless before I give anyone, official or otherwise, extolling E2EE a hearing I want to see them publish the following:
Their name and address.
Their online banking credentials.
Any additional ecommerce credentials they may have.
If they think think those are things that must be kept hidden then they need to realise that I have similar things that need to be kept hidden and that's what E2EE is about.