That general incompetency you're referring to there can also be worded as

For years they didn't build unneeded complexity. And it sounds like for many more years to come. So they're just efficient. Any developer will have had to make things configurable afterwards, that's fine, just evolution of code.

Hard coding also means that it's less likely to break. No customer (in Denmark) can influence this, so why make it configurable?

Over time this does become a problem when source code is lost/companies go under.