An example: I've got a neat new IP phone connected to an expensive, and powerful VOIP PBX. The feature set on the phone is magnificent! I'm sure it reads minds! However, I'm perfectly justified in saying to its designers "Can't you just put some damn LEDs on it so I can tell which lines are active/ringing/on hold. They're cheap, and if you can change the contrast of the LCD screen next to the line buttons surely you could light up an added LED."

My point is: sometimes people can't see the wood for the trees. Sometime they miss the obvious stuff and when they do it's a little silly to be annoyed by someone ponting that out by saying "Can't you just ..."