Edit: If I'm honest, I find this specific css fairly innocuous. I have a more general grudge that raw HTML is easy, free and accessible but we collectively insisted that it's not OK to use it.
The font is bigger, the lines are shorter, the navigation doesn't take half the page. The only thing worse would be the contrast but it's not that bad.
I do not think that word means what you think it means
The objective improvements from css here include: shorter lines are easier to read (per multiple legibility studies), the styling distinguishes navigation and secondary site elements from the main content (without css you get a half screen of navigation links), and the visual importance of in-page anchor links is reduced.
I prefer having a quiet single color background and being able to dictate how wide is the text I am reading than being limited by the website owner's choice. But that is also maybe just me.
Devs: please practice observing your site without css
Is it because of a misconfiguration on blender's end that should allow css to passthrough without verification, the query param messing a cloudflare passthrough default, or something else?