Farming bosses in Diablo 4 has been the definitive endgame experience for a while now, which has not changed with the release of the Vessel of Hatred expansion. While these bosses don’t drop Legendary gear anymore, they now only drop Unique items, which makes it far easier to target specific pieces of gear. And with the addition of Runewords this season, Tormented Bosses have become more important than ever.
https://screenrant.com/diablo-4-farm-materials-craft-mythic-unique-items-season-6/