..rofl, there is no way you are being serious right now as that statement is just ludicrous.
http://images.uesp.net/f/f6/SR-npc-Cedran.jpg
http://images.uesp.net/5/59/SR-npc-Captain_Wayfinder.jpg
Both nords. They look completely different.
http://images.uesp.net/3/39/OB-npc-Tolgan.jpg
http://images.uesp.net/f/ff/OB-npc-Hafid_Hollowleg.jpg
Again, both nords. Yet they look very similar, and have the same voice.
The diversity in Skyrim is a obviously good thing, but it does mean races are more difficult to distinguish than in Oblivion. That's just common sense.