From what I understand, as your Fishing, Collection, Cutting, and Mining Life Skills level up, you're able to collect, for example,
"Black Jade x5 Quantity" instead of just 1 quantity every few minutes.

(Vacuum Cleaner auto-collects every 5 minutes.)

On a side note. Anyone ever notice that the Fishing Life Skill is actually named Primary Fishing? I don't imagine we'll ever see
Junior Fishing or Superior Fishing.