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Kind of disappointed in not seeing end-to-end encryption being mentioned?

I thought it was perceived as one of the fundamental flaws of email.

No it's not. I found two dismissive lines somewhere towards the end of you link. That's not addressing it at length somewhere worth clicking towards.

Saving others a click:

> Re end-to-end encryption, that can be considered for the inner layer protocol. I don't rule it out, but it's not a priority at present.

...not to mention the leaking of metadata.