Why do it? To emphasize any problem you may incur in the future immediately. Then you can make a decision now within your 14 day return period to return it, deal with it, or ask for replacement.
Let's say you bought a car that is sometimes known to start blowing heat which smells like farts when the heat is turned to the highest setting. You are in the middle of summer so there is no need to turn your heat on high. Are you going to check the heat now on the highest setting, or are you just going to wait 6 months until your warranty expires and deal with your car smelling like farts?