Why are unit sizes still different between Gold titles?

[ComradeP]

Changes to the engine and mechanics are usually ported over to older titles from the latest title, as are the standardized McNamara values in the Alt versions.

Unit strengths, however, are not and I'm wondering why that is the case.

The gold releases would've been an excellent time to move the series to the larger unit standard set by Moscow '42, or Panzer Battles (converted to the PzC scale) or to some other standardized strength values.

I've bought Stalingrad '42 today to test the Fischreiher scenario, which I can't open at the moment, but it seems the unit strengths for the stock and Alt July/August scenarios for Stalingrad '42 like Don Bend are very different from the Fall Kreml scenario for Moscow '42 even though they cover the same time period.

Number of men for full strength formations in Moscow '42:

German motorized infantry battalion strength: 900 men.
German regular infantry battalion strength: 800 men.
Soviet Rifle battalion strength: 600 men.

Stalingrad '42:

German motorized and regular infantry battalion strength: 525 men.
Soviet Rifle battalion strength: 305 men.

From what I can determine from the OOB's of other titles, there's variety in unit strengths based on the standard that was in vogue at the time as well.

So, my question is: why is there no standard for unit size even in the latest updates?