> all that gives you is confidence that the message comes from someone authorized by that right/real person.
Which is good enough for many applications, I think. With friends and family, I am pretty confident, that none of them deploy a personal assistant to answer my encrypted messages. As opposed to a messenger where the service provider can inject ads into the messages.
How do I know that a person that I speak to IRL is really saying what they think or even really is who they claim to be if I don't know them well? A rest of uncertainty always remains.
