Because, in practice, a lot of people commenting don't actually read the article. As a convenience I've copied the opening paragraphs from the Wikipedia article. Is that against HN rules / norms?
Because, in practice, a lot of people commenting don't actually read the article.
Someone else made a habit of doing this a few months ago, with an almost word-for-word excuse as yours. They were asked to quit doing it. At best, based on empirical evidence, you'll just invite a flurry of downvotes.