Besides, you can just log in and change something. There’s no need to fire up a terminal, type commands or deploy changes. Just click save, from any computer with a web browser.
Github has supported creating PRs directly in the browser for years now. It's a pretty good editor with support for Markdown previewing and such. Depending on your needs, Github itself has been a "proper editor" for SSGs for a long time now. Now that Github Actions exists and you aren't restricted to only Jekyll as your SSG for auto-builds on PR merges, it is even better than before. (Drag and drop for things like images into PRs on the web has also worked to various extents in the Github web UI for some time.)
With github.dev (and the . shortcut) you can even create a PR in VS Code on any computer with a web browser if you want even better Markdown previewing with VS Code extensions and Settings Sync. (Even things like uploading new photos, you can drag and drop into VS Code on github.dev! Some of the domain specific data editors for your CMS needs you could potentially build custom YAML or JSON editors as VS Code extensions.)
I don't think there is necessarily a "hatred" for classic content management systems, but the tools have "converged" somewhat. Github is a reasonably good CMS with powerful web editing tools (especially github.dev) at this point, but more importantly the "version management" tool for the "Github CMS" is git so you know that you'll have strong auditing of content changes over time and also content reviews (code reviews, PRs) and things like that which other CMS tools do to various extents, but git was built to do specifically.
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Github has supported creating PRs directly in the browser for years now. It's a pretty good editor with support for Markdown previewing and such. Depending on your needs, Github itself has been a "proper editor" for SSGs for a long time now. Now that Github Actions exists and you aren't restricted to only Jekyll as your SSG for auto-builds on PR merges, it is even better than before. (Drag and drop for things like images into PRs on the web has also worked to various extents in the Github web UI for some time.)
With github.dev (and the . shortcut) you can even create a PR in VS Code on any computer with a web browser if you want even better Markdown previewing with VS Code extensions and Settings Sync. (Even things like uploading new photos, you can drag and drop into VS Code on github.dev! Some of the domain specific data editors for your CMS needs you could potentially build custom YAML or JSON editors as VS Code extensions.)
I don't think there is necessarily a "hatred" for classic content management systems, but the tools have "converged" somewhat. Github is a reasonably good CMS with powerful web editing tools (especially github.dev) at this point, but more importantly the "version management" tool for the "Github CMS" is git so you know that you'll have strong auditing of content changes over time and also content reviews (code reviews, PRs) and things like that which other CMS tools do to various extents, but git was built to do specifically.