Well what he is writing in the thread is not correct because no1 is dropping items 591+ on a consistend basis (if they drop them at all). I have never seen anything above 593 that is not crafted. So yeah currently all the best in slot items come from crafting (except arcana weapons as it is not fixed yet)
With dropped gear, you’re entirely at the mercy of RNG in what the item is, its quality, what stats and perks it has etc.
Whereas with crafting you know the GS range the item will craft into, you can manipulate the GS via trophies, equipment perks and high grade materials.
Likewise you can specify the perk that will appear though you’re then subject to attribute RNG.
You don’t have any control over drops.
So crafting your stuff means tailoring the item specifically to suit your needs while relying on drops is praying you get something useful.