> If we're talking about blogs/news, they don't ever get almost entirely rewritten.
Unfortunately, this isn't the case. It should be the case IMHO, but it (currently) isn't. The SEO/marketing people nowadays (ab)use popular pages for the search rankings and update them regularly to keep the content fresh and highly ranked (since search engines give much preference to new content).
Also, even for strict blogs/news, it's not unusual for a particular post to be a draft for many months before publishing. Most serious blog will fix the date to match publish date, but that isn't what happens by default especially in Wordpress (which is the most important platform for blogs).
Unfortunately, this isn't the case. It should be the case IMHO, but it (currently) isn't. The SEO/marketing people nowadays (ab)use popular pages for the search rankings and update them regularly to keep the content fresh and highly ranked (since search engines give much preference to new content).
Also, even for strict blogs/news, it's not unusual for a particular post to be a draft for many months before publishing. Most serious blog will fix the date to match publish date, but that isn't what happens by default especially in Wordpress (which is the most important platform for blogs).