Notion has no doubt taken note that a lot of people (myself included) use them as a quick and dirty wswyg web site builder. This new feature can be used for a lot of things, but it strikes me as particularly good for that use case. In fact, if I were a gambling man, I'd wager that their product roadmap is full of gems like this and are leading to them positioning themselves as a competitor to the likes of Squarespace and Wordpress.