its not about falls in a vacuum.
dial it back and see okw as a whole, does the army truly need a high DPS AI unit in the 1st place?
volks already cover that role and get more effective with vet, obers do that too without doctrines and okw never had problems dealing with allied infantry in the 1st place.
compare that to soviets/USF, conscripts, while useful, are just not able to match pound for pound against volks/sturm. penals are great but volks are still able to match them in equal numbers and at range. not to mention penals are more expensive.
rifles are the same, volks do well enough against them and have enough tools to stop a rifle push through smart placement and better cover. rifles cant charge them because STG upgrades, whoever breaks cover 1st generally loses.
so allies generally need elite infantry to supplement their base infantry to match OKW early game. but when falls come into play, allied infantry cannot hope to match the sheer amount of DPS going their way. HMG helps but its a double edged sword. the DPS that falls+volks can put out pretty much able to melt HMG while engaging head on as well as most allied HMG do not pin fast enough to negate incoming DPS.
which brings us to where we are now. it only gets worse once PZ4 rolls in, or god forbid, walking stukas that wipes the crap out of infantry.
TL
R: okw can field so much anti infantry DPS via volks/falls so early that allied units arent durable enough to weather it and melt.