Ninja'd by Zer, will post this anyway since I wrote it out
The no starting unit is to mirror the fact the Soviets weren't prepared for invasion, hence why the Germans made such great advances in the initial days of the war. In all seriousness, the Soviets don't need a starting unit, they are strong enough without one... doesn't take two seconds to place an Ingenery build order.
Also, please learn the difference between a feature and a bug. Just because their are some features different from other factions doesn't make them bugs.