Yeah, I guess it really depends on your use case and your overall system too. Our system connects to multiple vendor API's, so having one field for the rest of the address text would be very difficult -- we'd have to try and automatically split it into constituent parts depending on the requirements of vendors. Some of our data then goes to credit check API's too, so an incorrect address can result in an (incorrectly) lost order for us.

It's a challenging area all round.