The diagnostic is a CYA. I have a few clients waiting on this (and other forms/instructions to). I'll concede that it's frustrating.

Thankfully my clients have been understanding thus far. Especially for this form, the ones that can take a joke, I can say, "if you weren't so rich, you wouldn't have this form in your tax return."

And the gentle but serious answer, "better to wait and get it final than rush it and have to risk amending."