Reliability is something that can be taken for granted very easily. For example, when you go to a job interview and the boss asks you how reliable you would rate yourself and you give a 10 out of 10 for your reliability. Of course the boss is going to think that is amazing and that’s what they will expect from you if they were to hire you. But after hiring you it turns out that you actually only show up to work 3-4 times per week and call out almost every week then they can’t take you as being very reliable. This was the case with an employee that I hired at my previous job when I was a manager.