It's 2015, we are already in the "Mobile Era" and we all love how our modern sites fit and adapt to any screen. Of course, modern sites: pretty nice and flexible, stretching even to the 52 inches of a Samsung TV, High Resolution images... Its is just amazing. But you know what? We cannot forget there are almost 20 years of "non-mobile" websites out there, screaming to be upgraded. And the first word that comes out to our mind is pretty simple: "redesign".
Mobile OS manufacturers trend to improve their browsers to allow resizing, double tap zooming and dragging around, but it is just an actual usability workaround. It is like going to a disco that has mandatory night vision goggles to get in because it didn't had lighting setup when buil(weird huh?). You will end up in the floor, hating both: the goggles and the disco. You but you will still want to dance, so bye bye "Goggle Disco" and you'll go for a new one.