I don't agree. When the engine is crippled (very easy with KT due to its slow speed, acceleration, etc) it is really difficult to back up for repairs. Allies have many more options. Think about manpower economy. This is what makes KT bad, not its stats.
I don't mean to alarm you here... But that's exactly the purpose of busting a tanks engine. They call it a snare because it traps the tank. It's working as intended.
As for allies having more options?.
Stock:
Sov-combat engis
Ost- pios
UKF-sappers
USF-crew, RE
OKW, sturms, mech
Doctrinal:
Sov-con repair, self repair, repair stations (there are a few commanders that even have a combo of 2 of these)
OST-repair bunker
UKF - self repair smoke, advanced cancer repair drones
Okw- critical repair
So the conclusion is that the faction with the most, soviet, picking the right doctrine is tied with okw when they also pick the right doctrine.
Stock okw is tied only with usf, who obviously take the cake due to crews.
OKW doesn't have less options, you are just over extending and refusing to use the options you have.
The manpower economy can literally be subverted via mech truck. No pop cap upkeep nor model bleed. It sounds like you found your solution.
I'm not going to engage this any further and breathe and validity into the notion that of any tank, the heaviest and stock tank should be able to heal itself because repair drones and the best repair squad in the game isn't cutting it.