It was originally planned for Age I, and then after the hotfix for the ransom bug the devs edited the patch notes and renamed it to Age II for some reason, you can go back in some of the video reviews for the patch right after it got released and it is listed as an Age I card.
could be a balance choice to force players into choosing it over another card, or since its germans maybe they felt it was more competitive in rush if you got some uhlans with it.
Age II card slots are the most highly contested, it’s probably to make it more of a choice? You have to make room for an age II card, whereas an age I card is much easier to slot in.
I dream about change “Prince Electors” Home City card into Big Button in Town Center or Capitol + change HRE flag for this building to flag of selected by player German “Prince Elector”.