"Here's a goal. We've reached it. Okay, we're done" vs. "Here's a goal. We've reached it, but look at all the other pretty bells and whistles we may have over

"Here's a goal. We've reached it. Okay, we're done" vs. "Here's a goal. We've reached it, but look at all the other pretty bells and whistles we may have overlooked! We can't be done when there could be some cooler way of doing stuff or if we missed some architectural edge-case." Yeah, sure, you could argue that this is a failure in communication from the original coder to the audience, but it speaks to a focus on something other than getting the job done. Once you head down the lane of "but what about X?", you no longer have a clear mission to accomplish.