[rndgermandude]

The fact of the matter is, that when you disable the only defense against MITM by default, you should not claim your stuff is secure and end to end encrypted, because it is not. It's really easy as that.

Warning fatigue, "most" users not knowing how to do it or doing it wrong etc, are indeed hard problems to solve. There are indeed no easy answers to this, or else somebody would have come up with something already. But just because it's not easy does not mean you're entitled to just lie about the security properties of your system to your users.

>WhatsApp's end-to-end encryption ensures only you and the person you're communicating with can read what is sent, and nobody in between, not even WhatsApp. [...] All of this happens automatically: no need to turn on settings or set up special secret chats to secure your messages.

https://www.whatsapp.com/faq/en/general/28030015

Given that the only defense against a WhatApp MITM is turned off by default, the "not even WhatApp"/"automatically: no need to turn on settings" part is just not true.