Kindle

No, I am not talking about the device from Amazon. :-). I am talking about stuff you use to ignite a fire. Major problems will happen with software. Wrong decisions or unexpected changes can quickly get people angry. Usability is never big enough to do this. They often appear small, and trivial. Each is like a rock of charcoal. But put them together or add them with a fire and oh oh.....
Problems with usability always makes major problems worst. So never take them lightly. They look harmless by themselves, but adding them with a major "issue" can make a fire burn hotter. Many times you do not know usability issues are kindle making the fire burn so hot. Removing it can only reduce the intensity, but we all are aware that technology is not fireproof.