Mmm.
You said originally that Troop Training is good because it lets you play aggressively and just push the enemy off the map. The fuel disadvantage isn't a disadvantage if you "just take their fuel". That's what I took from your original point.
You can't play aggressively and defensively at the same time. Luring M3A1s and Snipers into traps and pulling back is inconsistent with holding more than your share of the map.
AT guns and munitions for mines take way longer to hit the field than most reasonable counters to elite infantry anyways. AT guns are actually delayed an additional 25 fuel due to your training opening anyways.
If I deploy the counters and take my half of the map then I'm just ahead in fuel basically. I don't have to play aggressively against elite troops. It's the opposite of what you want to do. Elite Troops is always behind if they use Troop Training. They're the ones who are supposed to have the incredible early game. If I just stall into my superior and faster mid-game then I can just turn the game on it's head pretty quick.
I don't want to get into some sort of theory-crafting war but I will say that everytime I see a vet 3 unit in the first minute I am a-okay with that because that player will be behind the rest of the game for little gain.
edit: Basically, I just completely contend that "Vet 3 Tier 1 Ostheer Units Guarantee Map Control". It's not guaranteed at all against an even opponent.
I guess it just gets to me since I usually do con con con molotovs con and then more cons or maybe support building to at gun with at nades and I attack an important point as soon as I can get three cons evenly spaced out with molotovs. Usually a pretty safe, bland opening where I win or lose the first skirmish depending on micro but gren spam with troop training shuts this down no problem.