Unfortunately, the popular graphical browsers AFAIK do not allow the user to disable CSS. Other news sites that use AMP, such as WSJ, use CSS as well as Javascript to annoy the user. Disabling Javascript is not enough. It is possible to remove the offensive CSS from a page through the browser's developer console, developer tools, etc. but at that point we may as well use a browser extension.
Here is a filter for WSJ.
sed -n '/<article/,/<\/article/{/./{/<h1/,/<\/h1>/p;};/<title>/,/<\/title>/p;/./{/<p>[^<]*/,/<\/p>/p;};}' a.htm
Here is a filter for WSJ.