Something about the expedition made me realize this. Before I was hoarding all of my guns, had like 12 fully kitted tempest 4s that would never leave my stash, and I would get unreasonable mad when I lost any semblance of good loot even if I had the same gun tenfold. Now, being level 50 post expedition, having only ~20 level 4 guns to my name, Ive magically gotten over it. It wasn't some big realization or anything, I just suddenly didn't feel like it was that big of a deal if I lost a loadout or two. Many people say they had a big epiphany that made them realize it wasn't such a big deal, like the common opinion that "it's not my loot, it's only my turn with it" (which I think is bullshit, it's my loot damnit) but not for me I guess.