User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-126761-20150519140106/@comment-126761-20150519141727

Adding a preference wouldn't really make sense, to be honest - it's best for articles to look consistent across devices. If users all see articles differently, it's difficult to make articles look good for everyone.

That being said, personal CSS settings are not something we're taking away.