There are two purposes here, Nettie.
1) To hopefully give a nudge to those people who haven’t updated in a while. This is me occasionally. I can go a while between updates, I know. But of immediate concern are those people who haven’t updated since the beginning of November - or longer ago. You obviously don’t fall into that category.
2) To give a place to post “I updated my blog” to let people know to go read it. I frequently miss it when it’s mentioned (particularly early in the day) in the daily thread. I check most people’s blogs regularly, but not always. It would be nice to know when they’re updated in case I wasn’t going to check that day. Everyone falls in this category. Hopefully.