Thanks so much, John for this explanation. That was really helpful, as sometimes it’s about understanding the concept & basics before diving deeper into technical implementations 👍
I also noticed it’s probably not so convenient to show an archive of all authors from a specific country if the country is added as an ACF. So for that it would be also better to use taxonomies.
For my use case though, I might still go with the ACF field as it’s easier to handle for a starter.