The longer someone uses a product the more likely she become “blinded” to the small failures all products have. This happens not only with regular users of a product but also with the product manager who manages the product and has the means to correct these small failures. It’s not unusual to hear the phrase “that’s the way it is” in such situations. This is the reason why it’s always good to bring fresh eyes to fight the “that’s the way it is” inertia.