I certainly am not disagreeing with you on the historical concept and especially with the War at Sea where you can play with ships that actually represent ships that were in the fleet on a particular day. There are however many books out there, written by dreamers and histoirians alike, that attempt to paint the “what if” scenarios just like we do with these games when we try to start within a historical context and then see how things turn out.
Therefore, if one wants to explore the idea of the Battle of the Atlantic with a German air carrier capability one will have to borrow a ship from some other nation to represent the concept that Admiral Raeder was successful in his fleet developments during the 1930s.