Iron banner drops are separate from crucible drops. Iron banner gear is just rarer that's it. Why would the mode shower you in loot? It would defeat the purpose of the rep system.
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You shower in crucible loot when you play crucible. It would only be fair to be showered in IB gear when you play IB
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That's ridiculous. IB gear is rarer. Being showered in blowouts isn't remotely equivalent
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For the most part, IB gear is not systematically better. This is not Trials. It's just an objective based limited time event. It's not really competitive, there's no reason for the drop rarity.
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Armor can drop with higher stats which crucible cannot. The weapons are also arguably better. Thus the rarity