I am constantly seeking to improve my writing, so your thoughts are duly noted. Especially on points 3 and 4, I think I can clean up some of my own work.
I do think, however, there is some room (as you note) for having one-sentence paragraphs and fragment sentences when they are used to create a specific flow or emotion for the reader.
On the flip side, I see your point in that, if the entire article is filled with those types of sentences, it becomes a problem.
Thanks for sharing this. I think these are good reminders for the Medium community to consider.