I was think over this for a day or so, and the fact that you are waving it off makes so sense. Here's why.
1. (most important) If you can use heavy weapons good enough to counter something like Truth, SSimulant, or Qullim's Terminus, why be in a compatible match?
2. Heavy is like a super, it is used only every now and then and is meant to give a few easy kills. Then if you are very good, you can make sure you don't get killed by heavy. Don't get me wrong, I know I have casual-like stats, but I am reasoning with logic here.
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If heavies are like supers then MG's are prenerf sunbreakers [spoiler]#Sarcasm[/spoiler]