Everyone is bad designers then. All of them rely on operating system providers not stealing your messages. Some with the people providing the chat application. Since they have to be able to display messages they are able to log them somewhere.
Society needs trust to function.
You can compile your own operating system and control your hardware supply chain - you don't have to rely entirely on trust for those components.
> Since they have to be able to display messages they are able to log them somewhere.
If they're end-to-end encrypted, no, the people providing the chat application can't log anything except noise. That's what we're talking about outlawing here.
Regardless of the above, when I say 'system' I'm referring to a cryptosystem, not the other parts of the software stack.
https://www.cs.cmu.edu/~rdriley/487/papers/Thompson_1984_Ref...
It's unrealistic for everyone to audit their operating system and hardware.
>If they're end-to-end encrypted, no, the people providing the chat application can't log anything except noise.
Yes, they can. If you used a comprimised Element app your encrypted Matrix messages can be stolen.
> Regardless of the above, when I say 'system' I'm referring to a cryptosystem, not the other parts of the software stack.
If your cryptosystem is compromised nothing else matters. Your argument seems to be “we shouldn’t worry about secure cryptosystems because these other unrelated things could go wrong,” which I’m not interested in debating with you.