Some of the comments I've read seem to misunderstand the purpose of this page. This isn't the objectively best writing style, this is a concise writing style. No, it might not be the most pleasant to read, because extremely to-the-point short sentences sound blunt. The guidelines provided for writing short and concise sentences are very useful, if that's the style you are aiming for.
Exactly. This is more for technical writing, not sales copy. That being said, a sales copy equivalent would be nice.
A lot of sales copy could benefit from a more concise, factual writing style too. There's a mountain of research to show that people react negatively when they feel they're being played, yet advertisers continue to make obviously inflated claims and use meaningless buzzwords. :-(