User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-3236835-20150519225751/@comment-126761-20150519234732

It's what we're still doing - the mobile skin still exists, and is a separate entity to the tablet/desktop skin. That aspect comes with it own problems - I'm sure you've noticed how different it can look to the full site skin, and that's not really ideal. Trying to treat the transition between desktops and tablets similarly would likely add a whole host of issues itself, not least around deciding at what point do you make transitions?