>it is but it's not feasible for the system theme to change the styles of websites.
Just ask any Linux user that uses dark themes and you will find out what happens when the system theme messes with the site theme.
It is done completely different fashion than it was done on gnu/linux, on linux it was probably done by changing user agent style sheet (changes default bg color on body etc), when here it is done with media query (which webdev must explicit implement on his part so he can make sure that everything works).
Aside from this article,
why css as a whole is such a unmenagable mess? The whole frontend "separation of concerns" is fucking stupid: data - html, look at any modern website - you see div soup holding no data,
css - try making some runtime customizabily eg. change color, layout on ie11,
js - contrary to popular opinion, js does what it should do :p
Maybe it was holding water when all pages was as complex as hacker news but currently we need something which is little more sensible
It is done completely different fashion than it was done on gnu/linux, on linux it was probably done by changing user agent style sheet (changes default bg color on body etc), when here it is done with media query (which webdev must explicit implement on his part so he can make sure that everything works).