Possibly my most popular all time tweet (😂) now probably wrong?
marketing site is now a part of the full stack rails app. Unlocks so many neat app/agent-powered features that would be so much harder with a separate CMS.
I can't over-emphasize this enough for folks at the earliest stage of building your SaaS. Put the application on a subdomain like app.your-product[dot]com and have your main .com be an easy to use CMS marketing site like Wordpress or Webflow. So annoying to unwind after the fact.