The position you're taking, roughly that with limited resources you have to aim for achievable goals and while distributed federated networks are the underlying reason Signal works, it can't try to replace them right now, is totally reasonable, although not everyone will agree. However, that isn't at all what Moxie said. Instead he made no acknowledgement of the distributed nature of the phone system, he suggested that everyone who disagreed lived in the imaginary past, and suggested that his approach was the only sensible one. So I'm not inclined to read it as charitably as I read your comment.