When piglins are exposed to the overworld it would make more sense if they froze to death. Just like the strider, they're used to hot environments. So in order to invade the overworld they'd have to place lava close to where they're standing so they'd keep warm. To become a zombie you need something that infects you or changes you and a temperature change wouldn't. Meanwhile soul fire would be a perfect infection agent as it would mean that souls are escaping the fire and possessing the piglin which would warrant a fear response. Additionally Nether fortresses should have their entrances constructed with multiple types of soul fire related blocks so piglins would be afraid of making raids to their enemies fortress and would stay plotting in their bastions which have gold which should heal and protect piglins from soul fire.
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