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How is that unusable? If you just don't upgrade it still works.

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.