I don't see any issue with the map looking like RL. It helps to create preconceptions about geography and weather systems in areas that people aren't occupying; we all look at Solaren and go "that's Italian" so the parties invading it can all reach an easy consensus as to what the terrain looks like without any argument. People can look at the Germanic regions and go "cold winters, lush forests, some mountains but mostly flat" and they'd probably not be far off when describing Franken. They look at Agderike, think "Scandanavia" and have a good idea what the terrain is like, because the guy that put his country there had the same idea. It also helps people look at a map, think "I want a German country" and they know exactly where it should go. If we did it otherwise, you might get Englands in Himyar or something saying that there's coniferous redwood forests in what everyone else thinks should be the desert and that the winters are extremely cold and the summers very mild.