I understand the reluctance, because of the impact on already indexed books, to revisit the eggs-indexing guidelines. But I have to agree that it needs attention. Not least because they're so complex that it's quite hard to be sure one is following them. That makes me skeptical that EYB staff indexers are completely consistent.
At a minimum, without changing the current policy, there needs to be a chart that makes it possible for indexers to verify whether they are following the intentions of EYB rules or not. For simplicity, it should take the form of a grid chart:
Across the top:
Whites (or yolks) ------------->
0 1 2 3 4
Down the left:
Eggs
0
1
2
3
4
The spaces in the grid would be filled with the correct indexing entry for that situation.
It might be an interesting exercise for everyone who now does EYB professional indexing to fill in the chart on his/her own, and then compare notes. I tried to make this chart for myself as an aid to indexing, but found myself unable to complete it (torn between apparently conflicting mandates). Was grateful that my indexing efforts so far had been mostly cookbooks without much baking/pastry/dessert emphasis or egg complexity.