Why do you use flour and eggs when you bread?
The flour has more gluten in it and is needed for the bread to
rise. Eggs are not often used, most of the bread that you buy in
the store does NOT have eggs.
Bread that does have egg in it, may have it to help bind the
flour and other parts together, but is likely to have egg primarily
for flavor purposes. With yeast bread, the gluten that forms
usually means that the bread does not need egg to keep it
together.