No doubt we've done that when the topics are separate, but that's not the case here. It doesn't make sense to have one front-page story about San Francisco banning public events, another about Denmark doing it, another about Italy doing it, three more about specific events that have been canceled, and so on. Front page space is the scarcest resource on HN (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...) and the most important thing is that it not be spent too repetitively.

If you or anyone is interested in how we approach this, I recently wrote https://news.ycombinator.com/item?id=22527396 about it, and there are lots of links there to previous descriptions.