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If you want security and privacy to become mainstream, simply make it a boring, invisible implementation detail of your messenging platform which is superior in convenience

I believe that is precisely Signal's philosophy. Which is why for example it uses/requires a phone number instead of a username - which then people also complain about on HN and elsewhere. That it's less convenient than other messengers (which I don't dispute) is not for the lack of trying.

So I suspect the answer is the loudest users/commenters will "never" learn this.