User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-10112739-20150519194105/@comment-126761-20150519194817

Unfortunately, that wouldn't really solve the issue - we don't want to force users to download an app, and the issue of working out how to make articles work nicely across different screen sizes would remain.

(That doesn't mean apps aren't a good idea, mind you).