Based on the way you responded to different points in his post, I'm inclined to believe that its just a way to avoid responding to certain parts of what he said.
But anyway, Since you are asking for sources where Heavy characters are balanced, I would like to ask for games where they are not balanced, like you seem to think are everywhere. So far you have only mentioned TF2, which if you ask me is balanced pretty well, all things considered, and is still being tweaked to this day. Natasha is a bit OP, but they are working on fixing that in their current beta. Yes, one on one, the heavy is overwhelming, but both teams can use them, and they are an important part of most teams. At the same time, a team that was all heavies or all heavies and medics would fail.
You site TF2 as an example where heavies fail, but in my experience, a team with a good balance of all of the classes is the one that does the best. This is what I said earlier, and you described it as being far too hopeful or a perfect situation, but I've seen it work out that way in a real, competitive, game.
You also have to remember, he is strictly speaking about competitive play, not pubs. So even if you had an example where Heavies work, if it doesn't apply to comp play, he doesn't care. I find his request laughable - how many shooters, that are played at a competitive level, even have a light, medium and heavy to choose from? Like as handful? And out of that handful, he's asking for an example where Heavies are not just balanced, but balanced to competitive standards. It's also laughable that the method of him "disproving" any suggestions, is just him saying "nope, they're not balanced," and then giving his opinions why, so even if you did find a valid example, he would probably dismiss it regardless.
