You are right that USPS maintains a database of canonical delivery points. However, it's inevitable this database might not be correct or up to date. If you do

You are right that USPS maintains a database of canonical delivery points. However, it's inevitable this database might not be correct or up to date. If you don't want to validate, then yes addresses are just a series of text fields. However, mapping them to that delivery point is where the problems arise.