The team is now working on the WordPress Interactivity API. This unblocks the same UX Frontity framework enabled but directly in WordPress Core, fully compatible with the new Site Editor.
I just got started with Frontity, and I’ve cloned the theme from @awsmin/f1. I’m not sure what did I change, but now the blog posts will be redirected back to my WordPress site instead of launching in my new frontity site.