Your problem are not the Blowouts, the drops are seperate from each other.
The problem is the stupidly low drop rate of IB gear in IB.
Hell why are so many people so obsessed with taking away the double dipping on loot for IB?
If I have to play IB, I gladly take the chance for good playlist weapons (as well as the shards) in addition to a (hopefully in the future) good-ish droprate of IB stuff.
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A lot of people don’t understand that removing the crucible drops won’t magically make more iron banner loot drop. Just means you’ll get less overall.
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The issue is, if you've played this game any longer than one season, you likely have weapons that are superior to anything in the crucible loot pool. Which means, when you get a Blowout, you're essentially getting nothing for your time. So, you could conceivably play let's say 10 IB matches and get nothing, that's stupid, and a time sink which Bungie was allegedly moving away from. Remember when they said they "valued our time"? Apparently not.