If you're familiar with the space, ever heard anything that ticks all these boxes:

(a) git versioned

(b) CRDTs

(c) WYSIWYG but Markdown (esp GFM)

(d) front matter + markdown able to be SSGd

(e) comfortable UI for not-devs

(f) native (Swift) MacOS app, else Tauri/Electron self-hosted client+svc

(g) if online, OIDC / SAML SSO

Appears this can be cobbled leveraging Obsidian plugins, but unstable due to git vs. CRDT issues. And there are a few "CMS" for SSG stacks that almost but not quite meet this.