I mostly agree with these, although not always 100%. For example, as much as I like the idea of a list it should be subject to change. Both additions and subtractions. Say you have a pen on your list, but get an opportunity to try it out and after doing so determine that it isn't the right pen for you. Too heavy, too light, too big, too small. Or something else entirely. Take it off your list. It shouldn't be set in stone like the 10 Commandments. Likes and dislikes change.
Likes, dislikes, and preferences do change, so the list has to be dynamic.
Pens should go on and off the list as required.