So I've seen a handful of people upset that the Veterancy system seems to be gone. Units leveling up from combat and such. And yeah, I agree it is a cool idea to have units level up during the battle and I guess for some it makes the players want to preserve units more.
But having played COH2 online for a long while, I have to say that the Vet system easily leads to snowballing. Or in other words, the player with more experienced units will have a significant advantage over your less experienced units.
For example, a US Riflemen Squad vs a Volksgrenadier squad will generally give the win to the Riflemen. They have Semi automatic rifles and they do cost more than Volks. But when you have a 3 Star Riflemen squad vs. a 5-star Volks squad, that Volks squad, despite costing less than the Riflemen squad to buy and reinforce, will defeat your Riflemen squad.
The Vet system also gives factions with the stronger units by default even more advantage over the factions with weaker units. I.e. The Panther tank, which already is well armored, deadly, fast and will always defeat most Allied tanks 1 v 1, will now be even more powerful. Allied equivalents like the Sherman or T34 or Cromwell are less armored, less powerful, have less HP, and are slower. Less powerful guns means their cannon fire will bounce off a Panther, thus they dont get any experience for doing no damage. Less HP means they either can't stay on the frontlines long or they die. Either way they gain veterancy slower, lose all those points in dying, and will often fight an uphill battle against the faction with the more HP and better stats which are still accumulating.
The vet system really just benefits the stronger faction. Survivability is what allows your units to level up. And most Allied units are weaker which means they level up slower or die. And the Axis faction, generally already better in stats, will just get even stronger with high Vet levels.
And I don't really want DOW3 to have that same issue of units with better starting stats just accumulating points just because the other factions' equivalents are 'weaker'.
Personally either I'd remove the Vet system entirely which I thank Relic for doing in DOW3 or maybe have only one Veterancy Level that just unlocks the unit's ability. Most units in COH2 unlock their abilities in Vet 1 and I think unlocking abilities is better than improving their stats after Vet 1