Addon authors signed up for this. They signed up to be Alpha testers, with the explicit intention being that they provide feedback on what is needed to make the API work for addons.
No one else but the addon authors know how their particular coding for their particular addons work.
Without feedback to Blizzard, there is no chance for the correct portions of the API to be opened up.
I get their frustration. But I don’t want to see authors just throw in the towel. Without their feedback, we won’t get anything.