This is a strawman.
Nowhere did I say that JLI/Falls were no longer effective or that they were 'trash'.
Before the nerf, JLI/Falls were over-performing; you'd see them in essentially every single game involving OKW, and they would be used as mainline infantry, completely replacing Volks. This is currently the state of the M36; it's fielded in large numbers (2-3+) in every USF game, simply because it's so dominant against other vehicles.
Nowhere have I said that you said JLI or Falls were no longer effective or trash. "Trash" part was my sarcasm related to how I think a comment on these units being "good" is an understatement. I said that you referred to them as if they were no longer very
effective post nerf, even though the selling point of JLI and Falls stayed the same before and post nerf, with their most desired features being 75% crit + and excellent DPS at all ranges respectively.
I would also like to point out that when major change hits a unit (like the Falls buff we had), everyone extensively tries the unit out. Even if a particular doctrine has a very strong unit, some people like to play with something else for a change every now and then. You don't have to necessarily associate lower frequency of Falls plays with ambush bonus bug fix + 20 MP cost increase + vet req increase. 340 MP for elite infantry is the low end cost and if you use your Falls properly they should still vet well. I don't think these changes were significant enough to consider Falls transition from being "OP" to just "good".
You can often see in top 2v2s that OKW player decides to go with 3 Falls strat, so in this regard the game has not changed much.
There were also more than just JLI change that affected the frequency of Overwatch doc picks. Flares that have to be planted manually, changes to the howitzer barrage cooldown, attractiveness of Panzerfusilier blobs and early snare availability, Tiger I for OKW, changes to overwatch skillplanes, all of these influenced the doc pick meta for OKW. Also for the other doc with JLI, it had a dead commander ability being thorough salvage that was initially suicidally long or didn't work post rework for a long time + ineffective synergy of JLI and infiltration nades. Infiltration nades are a good ability that is very situational. Scavenge doctrine is very good with the AI/AA Ostwind and JLI alone, but other doctrines can offer you more powerful tools. What made the JLI not spammable is the 100s cooldown. It's difficult to wait for so long to fill missing space in the infantry roster without sacrificing map control.
Reason why people build Jacksons is because you can't fight axis 230+ armour vehicles with sherman effectively. This is why they build their tank destroyers. You can see Tigers almost every game post heavy tank buff. This is the only way not to lose the game as USF, you have to build Jacksons. Brits have Firefly + 6lb + extra stock tanks that can take a beating, Soviets can at least support their SU-85 with zis gun, satchels or Stun34 to trade for a Panther. USF relies primarily on Jackson. USF ATG ability is cool but consumes a lot of MU and may well bounce even if you hit the target. I don't think USF can afford any changes to the Jackson