A non-responsive approach to building cross-device webapps

I tend to do general freelance web-design as well as working with a couple of startups on a part-time basis. About a year ago I started to encourage my clients to provide a mobile option.

Since then I've worked with a number of responsive frameworks (bootstrap, foundation, less framework) and found them pretty decent for rapidly providing a responsive site. However I've come to the conclusion that for a fair amount of client work the non-responsive but device specific may be a better option.

Don't get me wrong I've secured work by demonstrating how a responsive website behaves by resizing the browser. It instantly conveys the flexibility and use case for clients. And for some of the simpler client work it works perfectly.

However I've also seen that usage behavior and expectations change from mobile to desktop. Increasingly I'm finding that what content is delivered to what device is far more important that whether the layout pops into a single column.

This article is exactly the starter pack of development techniques that I'd like to have to move from responsive frameworks to a more considered mobile and device specific approach.