I would like to see it more survivable that's all. I would kill to have a bulletproof light vehicle as OST.
It wasn't bullet proof.
Allied heavy machineguns ripped it to shreds, even infantry small arms would penetrate it without much problem at closer ranges.
Germans never used heavily armored cars, western allies did. AEC has literal tank turret mounted on it.
Its armor was half of that of AEC, Greyhound or M20 and only better armored part of the vehicle was its turret. Double or more weight of allied armored cars didn't come from fat american crews operating them, it was the armor.
Plus, its most durable LV for its timing and price range.
If it got anymore armor, it would have to lose all that health it got and it still wouldn't change how you fight it, because in hands of competent player it doesn't die to non AT infantry, unless you had bad luck, got ambushed and lost engine.