For Wurst v6.21 on Minecraft 1.12, a "deep feature" would be .

While most clients just let you dump a chest's contents, this specific combo allows you to walk past a chest and automatically suck out only high-value items (like Diamonds, Golden Apples, or Enchanted Books) while leaving the junk behind. It’s perfect for fast-paced looting in Factions or SkyWars where every second in a menu makes you a target.