Though I appreciate the effort they're putting into GPGTools, issues preventing one from using it on Sierra went on for more than half a year after Sierra went public.

I deem that unusable.

Except for those, who upgraded their machine and the old OS release doesn't run on it. Or myriad other reasons.

IIRC (but stand to be corrected), they had their hands full before that with GPG major version bump.

It's just too slow a beast, all of that. GPG (and especially email integration) is dying. Let's hope it gets a new life one day in the future.

Sure, reverse-engineering changes Apple does to Mail.app every year sounds like no fun. I'm actually surprised that they are ready at the launch day.

https://gpgtools.org/releases/gpgsuite/release-notes.html looks like that has been fixed. Have not tried it.