Is catering for edge cases something that people need to be made aware of? I find myself asking this question every now and then when I encounter this concept o

Is catering for edge cases something that people need to be made aware of? I find myself asking this question every now and then when I encounter this concept of content not working with design (especially when browsing on Amazon and seeing 24 results on a page that displays rows of 5 elements) How about catering for (from top of my head): - n elements in group (min vs max - ie top menu will always have at least one element, max element it can have is 10) - element defining properties that are always present and not (if we have Product box that Product will always have title; it might not have description, stock indicator, image etc) - width / height reserved for display of given element (each element reserves this width and this height, ie amount of products in basket is reserved to 20px / 20px irregardless of elements in basket)