I don't get that. You can't say that building a structure for getting your basic pool of units for one faction is making them lose map control that results in unfair advantage, simultaneously claiming that it is a basic design for the other.
Not 100% that this is what Hector means, but:
Ok, as SOV you have more or less three options to open the game:
1. Start with several conscripts and eventually tech either T1 or T2.
2. Start with T1 (which then will often be followed up by penals)
3. Start with T2 (likely followed up by Maxims).
Now, ideally (for the sake of diversity), each of these options should be viable, at least under certain circumstances. If you start by building either T1 or T2, you are loosing time and thus map control. If the units that you get out of the techbuilding aren't worth that delay, nobody would do it.
Now let us look at OH. Yeah, you have different options there as well:
1. Build T1 and proceed with Grens.
2a. Skip T1 for T2, holding out with Pios and MGs until then.
2b. Skip T1 for T2, replacing Grens with doctrinal units (Osttruppen or Assault Grens).
And all of the above occasionally happen, but in a fast majority of games T1 is build. This means that most people consider T1 units worth the delay.
Now, you might lament that 2a and 2b with the downsides that those come with are often considered less viable than 1, fair enough.
But the discussion here is that the units that you get out of SOV T1 have to be worthwhile to justify the cost and delay, otherwise you will rarely see the techbuilding at all.