I did a short stint as an instructor at a kids’ cooking school.
As an experiement we tried making noodz with whole eggs, just egg yolks, just egg whites, water and milk (just amongst staff). We cooked them all in salted water (measured the salt for consistency).
Anything that didnt have yolk was just all wrong. The color was off, they were so bland we couldnt salt them enough, and thr unanimous conclusion was that they just need yolks, period.