I believe the one big issue with DOIs is they rely on the resource owners to update the centralized database if the resource location changes. So links can stil

I believe the one big issue with DOIs is they rely on the resource owners to update the centralized database if the resource location changes. So links can still break/rot despite knowing the URN. Another issue is that it doesn't guarantee the URN (i.e. DOI number) uniquely identifies a resource. So a single resource can have several aliases, potentially confusing discussions or bypassing blacklists, etc.