alt Hacker NewsThese details don't detract from the efficiency. The postal code can prefilter every other field which can frequently narrow down to one. I would leave the ability for the user to override with free form data entry as data isn't perfect and changes over time.
I don't remember asking for "efficiency" in typing out an address, something we teach children how to do. It doesn't seem like a societal problem worth iterating over.
These tools are more than often wrong, and cause more grief for the user than any potential help it could provide.
There is no developer in the world that knows this data better than the person typing it into the form.