[wolfgang42]

The parent did say “targeted to a country you do [understand]”. The impression I get is that for most address handling the only thing that’s critical to have structured is the country; probably everything else should be free-text until you have a reason not to[1], at which point you should find someone who deals with them for a living (probably a third-party provider), and even then it's probably best to provide a fallback for the weird edge cases.

[1]: One good reason is that, as you say, people get things wrong—even their own address—on a regular basis, and you may be charged more money if you’re e.g. shipping things with the wrong postal code for the rest of the address. But even then it’s good to provide a workaround if necessary; post office databases can be wrong too!