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I see your point of view. Game had broken-strong units in the beginning and now majority of units/abilities are significantly less leathal than they used to be in the past. There is however a mild trend of infantry units getting buffed or arriving earlier for last 2 years. These buffs are mostly NOT at an alarming level, but they happened.
PPSH arrived at 3CP for years, they were always coming up against PGs, due to own stats and ability combinations, they were also much stronger in the past.
While I agree that Ppsh timing was always later than PG timing, you usually were building more Grens because you needed infantry and could not afford to wait for PGs much. You had 1 PG group maybe, because that's all you had room for in your roster. At the same time SOV always had bunch of Con squads that could later be upgraded with Ppsh which resulted in more con vs gren engagements 2 years ago. Per my understanding, it also made gren G43s more attractive to deal with Ppsh Cons, due to G43s performing better up close than the LMG upgrade.
This is a very subtle game dynamic change that compared to past power levels may seem negligible. I started playing coh2 a bit over 2 years ago, so I never played myself against AT-satchel Penals without PTRS, flamer Riflemen or super-Obersoldaten. I started playing not long after KT frontal armour nerf I think. This is possibly why I am more sensitive to these minor gameplay changes.
I wanted to thank you again for your detailed response. I know that you and Vipper have been playing this game longer than me so both of you remember the old-time opness, but possibly Vipper's point of view is more similar to mine about this topic and he might be reluctant to further continuation of this mild infantry buff trend. I am also aware this has not always been just buffs. Not that long ago UC and IS got hit by some nerfs, LT and CPT cost more MP now, M20 lost zook and got increased build time, 251 flamer got hit by much needed veterancy nerf, pak howie auto-attack got significant scatter nerf and is mostly used as barrage tool nowadays and remains efficient in that role, Stug lost some ROF, SU76 lost ROF and has muni cost on barrage. All of these were nerfs, but at the same time, they were good changes. I am also aware that many of these units got some sort of compensation bonuses like lower target size and increased rotation rate for Stug. This proves that both buffing and nerfing can be used to achieve balance. I am almost certain that Vipper has mostly recent infantry changes on his mind when talking about powercreep as vehicles have been maintaining decent asymmetrical balance receiving both buffs and nerfs for a while now with exception of heavy tank changes.