Reporting a user to WhatsApp forwards a copy of recent messages from that chat
E2E encryption in closed source automatically updated programs doesn't provide any real assurance: whoever makes the program can subvert your privacy at any time.Do you trust the author of the program? Then E2E doesn't add much. Do you not trust the author of the program? E2E doesn't help. Either way, what's the point? Sure, I guess E2E provides some kind of additional privacy at the margin or something, but you can't rely on it for anything.