"retaining a small amount of humidity whilst also allowing a small amount of ventilation. Some bread boxes don’t allow any ventilation, but these can cause too much moisture retention and allow faster mold growth"

https://www.foodtoimpress.com/bread/how-to-prevent-mold-on-bread/

Bread should be stored in a cool dry place to insure it lasts longest. Breadboxes are the opposite of ideal.

Bread boxes are antiquated tech in a time where bread was meant to be eaten faster and as a method of rodent protection. The same with pie cupboards/safes.