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The lubricant that's sealed in the chain is in the main pivot joints. The rollers are not sealed, and their lube doesn't stay in there forever. The O-rings and rollers need some lubrication added periodically. That's why owner's manuals give chain lubrication information. Rollers running dry on the sprockets is not good for them or the sprockets.
I don't like conventional oil or grease on sealed chains though. I've been using DuPont Chain Saver for a couple years now. It is wax based and leaves a non-sticky wax coating when it dries, so it doesn't attract dirt and sand to form grinding compound like oil does.
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