I've always imagined WordPress with its own CPT baked in without third party plugins or almost always doing it with code.
What if there's a fork of WordPress with native support for custom post type, aka custom content type, aka content model? Of course, you get to model your custom content and associated fields within the admin dashboard.
This Forked version of WordPress would have FSE removed but a different approach to compostable content authoring via block components as seen in some JS-cebtric CMSes.
In addition, what if this supports Twig, Blade, or what you suggest as a choice if frontend?
There are a few good concepts borrowed from Prismic, Directus, Statamic and Hygraph CMS.
It's OK if you think I'm living in my own fantasy world, but I genuinely believe this is possible.
Currently, I'm working on the UI.
Please let me get your take on this. 🙏🏾🙏🏾

Core is already adding it through Gutenberg. It’s currently a WordPress.com only plugin but coming to core soon after.