As per the links I posted, drafts have been written acknowledging AEAD as something worth having, and code has been added to support those cipher modes. I don't think that anyone is is ignoring authenticating cipher text. But as you said, there's an installed base of, e.g., RHEL7, that cannot handle that. Some code does not churn as fast as semi-monthly web browser releases.

If you do not like PGP/GPG, you 'just' have to create a better way of doing things, and then 'just' have to convince everyone to switch their workflows to it.