The late game MP drain of USF in games larger than 1v1 is normally the problem regardless of micro (no you can't sit in a nade and get mad you lost a squad, micro is still important). The loss of a vet squad is the real kicker since you'll lose the scaling for late game required to keep the damage up to equal the investment, factor in the extra 2x BARs (b/c base rifle men are ass) and you end up with a CoH2 equivalent of a money sink.
Throw in other things like
- Late game insta wipe abelites (sturmtiger, Stuka, etc)
- More cost effective units ( Falls, Obers, Hell even Pro-stropen beat rifles in cover)
- 5th man on rifle drops in 20~40 seconds of combat if feels regardless of cover.
- USF's railroaded tech 10 extra fuel to grab both tech = late Sherman
- MP expensive TD - Jackson which bounces more than it should for the cost
- Lack of late game rocket arty - multitude of posts asking for Major getting ColliOP
I can keep going into the nitty gritty, there's a lot that can go wrong in larger games for sure with micro, bad strats, and positioning but out of all the factions USF rly could do with a late game some sort of reinforce cost reduction seen with Wehr.