Why word count actually matters
Every kind of writing has a shape. A tweet has 280 characters. An SMS is 160. A meta description sits around 160. A LinkedIn post caps at 3,000. A blog article that ranks well is usually 1,200 to 2,500 words. Knowing your count as you write keeps the shape right without a second pass.
A live counter also tells you where a draft is thin. Fewer than three paragraphs on a topic that deserves depth is usually a sign to keep going. More than a full screen without a subheading usually means you should break the section up.