To people that are against whole world map there are people that are interested in flying transport/bomber planes that would like to fly from NTTR to Caucasus or Caucasus to Persian Gulf. Just because combat radius does match the map size doesnt mean that they will waste their time on making a map like that. Ferry flights, AAR?
Edit : Montreux Convention for the straits of Bosphorus and Dardanelles basically forbids huge ships like US Carriers entering Black Sea. Most of the missions we are making is semi realistic already. For the people that are aiming maximum accuracy whole Earth is must.