Well atleast blitz buff was cut in half for panthers and tigers so its not as bad as it was. As for defensive stance, yes it makes sense irl. But its arbitrarily just given to riflemen. This leads to other examples like, why can't grens do this even though the lmg42 is a better weapon? Or why axis don't get demo charges? See this kind of reasoning is just as good of an argument but it wouldn't be balanced. I don't have a problem with defensive stance, but as of now its only used to run up and suppress. Does great dps, no setup time. This ability makes most sense as a hold the line type of ability. Just like jagdpanzer recloaking, it shouldn't be available during combat and is an ability that needs to be used before an engagement.
USF need some adjustments to make them more well rounded, but that doesn't mean they should keep all the bullshit and strictly only get buffs.
Defensive stance outside of combat for all LMG wielding units could be interesting.