It’s to prevent the game from deleting items. If you were switching guns when loading into a place, you’d risk loosing them.
Just be glad that destiny allows you to open and manage your inventory while loading.
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Oh that's why, good to know
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This is one of the things destiny does that's a huge positive.
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Not being able to change my armor or weapon skins in halo infinite in que is one of the worst things I've experienced