It is a subtly different - and more persuasive - thing to say "Here are 10 books I liked, and here's why" than it is to say "Here's 10 books you should read." Imperative statements tend to evoke more visceral reactions than indicative ones.
When I use "I" in a sentence, people compare who they are to me, by trying to find similarities.
That's why the former is more persuasive.
Also as a general rule they will get more linkbaity attention.