You must be willing and able to reflect upon your own work and thinking with an eye to the constant and substantial improvement of the same
Being able to reflect on yourself is extremely important. I think this is a very important skill that you need to have for an A. But the other thing that comes to my mind here is a level of vagueness. It is hard to determine whether a specific student has an eye to the constant and substantial improvements of their own work. It is surely possible to judge whether someone improves, but the nuances behind the effort that comes with small or large improvements is harder to see. I still agree with this point, but it is something we all need to keep in mind.