Also, the MR horse is dead. We Soul Slayed it.
To sum up - you are not likely to win a war with Ulmish heavy infantry alone, but the other side of that coin shows you are unlikely to win a war with Vampire Counts alone.
Besides, people spend enormous amounts of design points on awake SC pretenders, sometimes -mostly- to slingshot them to a strong mid-late game, and sometimes with a very diminished usefulness after that. I see Production scales as performing the same role, except that they cost less design points, and they provide a consistent increase in gold income, in contrast to the awake SC that usually erodes your ability to take good scales, thus reducing your income potential through the entire game.
To be fair, I will do some early game expansion tests with just Rangers, but I admit I am quite skeptical.