User blog comment:Arbington/DLC Theories/@comment-2256917-20100916165342/@comment-1900300-20100917143558

I have thought of this myself. There is some talk from fans who want to have space dog fights with the Normandy. Other then that Shepard will probably face robots and/or enhanced indoctrinated foes. Bioware may not feel the need to explain it so much, like in Halo how the Covenant use ground forces despite being able to just glass a planet and call it a day. Some missions have to be added so you feel like your really making a difference in a war where infantry are really unnecessary. The easiest one i can think of is infiltrating and destroying a Reaper from the inside.