It depends whether the 0.7% failures are testing deliberately unimplemented features like email or is in corner cases in implemented features. It sounds like it's at least mostly the former, hopefully it's 100% the former.

I don't care if any git I use has email features. IIUC, even most of the people that use git with email don't directly use the email features, they use the patch set features like `git am`. I expect `git am` to work, I don't expect git to actually do email.