Imagine this, you're in Clockwork City, there's a lot of other people in Clockwork City, and many have the quest to gather Synthetic Oils from water sources.
But there aren't a lot of water nodes around. Also, you have something like 25,000 Lorkhan's Tears in your crafting bag... not exactly thirsty.
So when you find a node, instead of taking all of it, just take the Synthetic Oils. This allows that node to be gathered by another player, and they will also be able to get Synthetic Oils from it.
This is just an example. This works with all of the gathering quests, I just tested it with metallic fibers from cloth sources with a guildie. That doesn't mean I will do it with every node - ore, cloth and runestones seem to be fairly common, wood is less so but still available, while alchemy (if that satchel only contains White Cap... I may just leave those in there) and water sources seem to be the rarest.
Another secret that I learned is that those quests can also be completed in Blackreach, but I haven't tested that myself.
I simp for vampire lords and Glemyos Wildhorn