I'm more optimistic than this blog post allows for. I see email's trajectory over my lifetime and it looks like incremental improvements really do work, they just aren't fast. And I think just as Signal lacks an "Encrypt" button because that's the wrong UX (everything is always encrypted, no need for a button) that's email's future too. You aren't going to install "Really good privacy" and have encrypted email. Just one day perhaps many years from now you'll be debugging a weird problem and you'll discover that without ever noticing it your email is actually encrypted end-to-end and you're not actually sure when then started happening or how.