I suppose it is more efficient to have them all under one roof. Makes ordering armies and their opponents easier. I have a very few of the WW 1 German goblins (stahl helms) and French halflings. Not sure what I'll do with them (mix them in with my conventional forces for Weird War contingents ?), but they were such nice sculpts I didn't want to pass them up. (To my mind, dwarves would have been appropriate for a German army too - some other manufacturers have made German dwarves in either WW 1 and WW 2).