Personal unions were not considered to be the same entity unless one was eventually absorbed into the other (like with Castille and Aragon becoming Spain). They

Personal unions were not considered to be the same entity unless one was eventually absorbed into the other (like with Castille and Aragon becoming Spain). They didn't even have the same governments, and laws and citizenship were distinct between partners in a union. The only thing they had in common was the head of state. So yes, labelling them as a single country does seem wrong.