That, I think, is the wrong take-away. You're forcing elements into even more strictly defined buckets that can't scale responsively to different devices. I,

That, I think, is the wrong take-away. You're forcing elements into even more strictly defined buckets that can't scale responsively to different devices. I, personally, prescribe to the 1px grid system - where I write all my widths, heights and offsets in multiples of 1px. It helps keep things consistent.