When the list items that follow a complete introductory sentence are complete sentences, each item should begin with an uppercase letter and end with a period. They need a different lead-in and clear internal reminders of the nature of the list. A, B, and C are a comprehensive list, a closed unit. Items are equally weighted and function as coordinates or as a sequence or chronology. A, B, and C are a list of samples in the same category or a list of equal factors only one of which is key at a given point.
Items show a range or pattern.
A, B, and C are independent variables that cross categories but are equally key. The mixed pattern of phrases and sentences, including examples, in the bulleted items would be difficult to follow without parallel syntax, capitalization, and punctuation. Saying a list includes several items implies that others have been left out. Like too much of anything good, displayed lists can become monotonous, and writers who use them as a shortcut to telegraph difficult material or mask inadequate research give lists a bad name. Common sense is important when ordering items, no matter how duck-like they look on screen or on the page.