Firefox is sorta doing this too, baking in the functionality of addons so we don't have to install addons and keep them updated (which is also a security risk since addon authors are usually tempted to change the ownership of the codebase and introduce bad actors). You can run firefox now with their HTTPS-Only mode, aswell as block tracking attempts with 'strict mode'. You can even spoof the useragent with the `resistFingerprinting` flag which is awesome.
The differences seem to be mostly philosophical right now[0], so maybe someone will come up with a UX for opportunistic encryption that the Thunderbird team is comfortable with, and/or future versions of Autocrypt will support modes of operation that overlap with Thunderbird's approach.
[0] https://support.mozilla.org/en-US/kb/openpgp-thunderbird-how...
“gpg signaled an error; the applications didn’t adhere to the API contract. I have to agree with the GnuPG developers, …”
yet making the additional point that if your API leaves room for a difference of opinion to result in a serious security vulnerability, your API might have room for improvement:
“… and add: gpg’s interface was (and remains) a disaster waiting to happen, because it doesn’t guide the user to do the right thing.”