If the KT comes out and you have little to no proper counters, you probably lost the game earlier already. I know that the only times I've had one used against me with success was when I got outplayed.
What's a "proper counter"? 2 AT guns, a captain and a Jackson is a typical AT force we might have on the field. Two jacksons as the game draws on longer. In some theoretical, sterile laboritory environment that is more than a match for a KT. But it's never
just a KT.
We could have more, but if they're going an infantry/support weapon heavy strategy (and inf-heavy gameplay is very common in these strategies), we will be investing manpower and fuel in units to counter the LMG gren swarms (I don't call them blobs because they don't
necessarily all move in a single blob, although often they do at least temporarily), the Sturm/Shrek blobs, Falschirm spam, and eventually Obersoldaten on the field. Sometimes they get double ISGs, sometimes they stay with more core infantry. There are a variety of threats to deal with, but the Pack Howitzer is still underperforming, and the T4 Scott, while one of the best arty units in the game (I love them to death), is 75 fuel and comes rather late in the tech tree. Ever since they "bug fixed" the US 50 cal it's been pretty hopelessly unsurvivable in the face of axis units.
We still win sometimes, but you can't act like stalling for heavies is some unviable strategy in 2v2s and higher. Suicide in a 1v1 probably. But not in team games. OKW gets everything they need to fight effectively without using much fuel on units, particularly if they've got Ostheer support.