I believe domain setup has a bit of UX friction for people migrating from other platforms or brand new users that is fairly easy to solve.

1. Discovery -- The domain configuration is buried under Settings > Networking > Public Networking. New users probably don't find it easily unless digging through docs or clicking through Settings. A new tab dedicated to domains and networking could be nice.
2. www subdomain -- Even after configuring a custom domain, many users may not realize www needs to be added as a separate domain or it simply won't work. The one-click Cloudflare setup should automatically include the www record to prevent this.
3. Railway subdomains -- The auto-generated *.up.railway.app domain isn't obvious enough during setup. Surfacing it earlier would give users a working shareable URL immediately, without needing a custom domain at all and could be an opportunity to share you can buy domains via Railway.