I don't really think this is an issue since soviets already have a major advantage is close quarters combat thanks to conscripts and their molotovs. While I agree it makes for some boring gaames on Kohlodny, giving soviets strong handheld AT would make it impossible to use German T3.
+1
I don't think that Soviet AT is bad at all. It just requires some thinking and good positioning to bring it to its full effectiveness.