Ask HN: Why doesn't Notion offer custom domains for Notion sites?

It's possible to hack together a pipeline that redirects a custom domain to your public Notion website. There are also a few websites that offer this service for a fee. But why doesn't Notion do it as part of their product offerings? It seems to me such a no-brainer. Many people use Notion as their personal website and this feature would make Notion a much more user-friendly solution to having such websites.