Its much durable, and 2 mins is a lot of time. Some units got delayed by 10-20 seconds and completely fell out of use.
Mainly because stug E needs it armor/HP since it actually HAVE to stay on the field to shoot and recieve damage in prosses. Again, sure stug E can 3 shot squads (but relistically you need to hold-fire and attack ground to do it consistently so additional micro is requred), but it cant do it from the distance which requres you to dive it\push. Again, the reason stug E has its armor - because its exposed to TDs\AT guns\Inf\Snares constantly, if the stug E is shooting at you, then its in range to be attacked back.
Scott on the other hand can do it from the distance where its not threated by anything unless enemy is diving you AND on top of the fact that the only way enemy can get you - push the attack (which on its own forces enemy to play on your terms) but not only that.
Even if enemy is diving you, you still have 2 hits window to survive, you still can use smoke on top of that and you can de-crew scott to mess up enemy tank firing and force it to stop-A move it in order to finish it. And all of this on the unit which effectively can stay out of enemy range\behind sight blockers and not even need to be exposed to the enemy. And you can safely add RNG aswell, that your diving tank can miss on the move, hit something and so on.