The situation is not as black-and-white as you paint it. English is an ambiguous language. It's a "no op" in the sense that there is the possibility that they ship an app update in which the crypto is comprimised. Fair, that's possible, just like it's possible that your phone is backdoored or the CIA has installed hidden cameras in your bedroom. But as long as these things have not happened, specifically as long as Signal ships an app which corresponds to the code up on github which has been audited time and time again, it's not a no op and works perfectly fine. That's very different from sending a plain-text email or painting the message contents on your window. Please stop conflating these two.