Blizzard wasn’t creative enough to make items matter properly, despite the answer existing in Diablo 2, so they’re making it so anything that isn’t Legendary auto-salvage when it drops.
Once you have ilvl 750 gear, you’re hard-capped until you do Torment, because Ancestral items (ilvl 800, 1 guaranteed Greater Affix) can only drop in Torment. Temper your gear and do some nominal Masterworking if necessary. Use gems/enchants to fix your armour and resists, and don’t ignore life rolls.