Much of this comes from the assumption you have 3 level 28+ guardians to run those all with.
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My point is, if you have time to loot cave you have more than enough time to creat extra guardians. Even if they are the same class to save time. You will get much better loot running raids multiple times than loot caving.
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Yes, but after beating the raid and nightfall looting is much more efficient than running strikes.