I use bullets intentionally to break the flow. Nowadays many readers are getting tired of too long passages, and bullet points are one way to give the text visually more structure.
Yup, that's a great point. This article is based on a chapter from my book but this is chapter 6 out of 13 already. In earlier chapters, I discuss how we need to know the content, the goals of the text and what are the user's goals (read, skim, search etc.). Of course, we can't be 100% sure on their goals but we can take an educated guess based on the content we're designing with. Decisions like these should be based on that (+ personal preference of course).