To sum up, allies have both more tools to finish off a crippled ost vehicle and more tools to save their own damaged vehicles.
What a load of rubbish, axis vehicles are way more survivable than allied ones with all abilities considered. You dont really need to risk axis vehicles too much, your supposed to play carefully with them and grind your opponent down. Allies however need to make early impact count with things like T70, so they need to risk them in order to press the advantage.
Ost has way more issues while stuck in T1/2 than when they get T3/4 out. Best bet is learning how to use the infantry based AT to best effect. You dont HAVE to kill something like a T70, just soft counter it so its not winning the game for opponent, once your armour arives then things get much easier.
Pio has tellars
MG42 has AP ammo
Gren has faust
Sniper has incendiary round which can finish a LV in a pinch.
Just gotta learn to be confident and clever with those abilities.