I can understand the opportunity cost but more for the lost steps to train (which I admit is hard to evaluate as it can vary from little to huge). For the tech advancement, whether one waits to upgrade in 1942 or builds in 1942, the tech cost will eventually be the same, and in the same year. And a January 1942 mech is not a bad unit at all. Seems to me that by waiting only 8 months or so, one gets a much better defensive value for its PPs to repair (the 10 steps ones at least) than to scrap. I'll try to test defensive effectiveness more thoroughly when I have time.
This of course would be false if the Soviets need to scrap the bottom of the barrel for infs prior to Barbarossa, but my intuition for now is that for most games, with the actually changes, they will not be that pressured anymore. Of course again, it depends on temperature, skills, OOB, strategies (I think most Soviets did not run away enough, I included; not sure how necessary that is anymore however)...
However, one thing I did not yet take into account is that if the corps (build from scrapping the mecchs) do survive and transform into 1/2 armies, then the PPs cost starts to be more interesting for the infs. as you can save on future builds maybe.
I also see, of course, the need to sometime disband units. But it depends what the Soviet wants most: PPs or time. You example of disbanding an XP lagger is the most efficient for time but will cost more PPs (sometimes very little more, sometimes almost double). Another way is simply to send it into combat. Low XP steps will die and be replaced with 50Xp steps and survivors steps will even improve (sometime very fast), and the unit will even do stuff to the enemy meanwhile instead of been in the queue.
But yes, I agree and I can see how for really big laggers that did not see combat yet, or very little combat (XP still in the 20s for example; or have no opportunity as you say [crowded front I assume?]) the PPs cost will not be that much more to disband indeed once taken into account losses necessary to improve and the 50% PPs you get back for disbanding. I've done it to.
I do not think there is any absolute answer to a game with so many variables. I depends so much of context, the players strategy and also the... opponent.
< Message edited by Nirosi -- 7/30/2021 2:36:10 PM >