To be clear, when I listed something as a potential challenge of dick sucking it doesn't mean I don't also recognize it as an element of eating pussy, just that I view that element to be more challenging for dick than pussy.

I absolutely agree everything you listed is key to good pussy eating but hand usage for dick sucking has a higher skill ceiling in my opinion. Grip strength, rhythm, syncing up with mouth movement, ball fondling while stroking, and women have to change up tongue style/focus too. It just seems like it would be more complex to me comparatively speaking.