Here's the tl;dr:

* The best blog posts are narrowly scoped and focused on a single point

* Trying to do too much in a blog post can distract from the main point and weaken the argument

* Having a clear, well-defined main point improves the clarity and persuasiveness of your writing

* It also increases the shareability and reference-ability of your piece

* Respect your readers' time by making the main point clear upfront

* There are exceptions to this rule, such as educational pieces or literary works