If a flame HT or luch gets rushed and he dives your single AT gun, gg. Soviets/USF can at least deal with that by having AT nades. So you need two 6pounders for a single luch, which is just dumb and again makes the AEC a necessity to balance your AI/AT army composition.
Thats why i always have special weapons regiment commander in 1 slot if i see a light vehicle spam i use the IS with AT rifle they are very good vs light vehicles and will turn the tide.. that commander is also good for late game play HOld the line is awsome when used at the right moment.
If you can keep your sniper alive his crtical shot ability acts as snare you can keep vehicles at bay if he spams multiple vehicles bring in AT rifle IS.