[JMill]

While my inner webdev agrees with you, my interpretation of the mmm.page philosophy is that planning "breakpoints" etc takes too much thought, and hence runs against the "mindless" aspect.

"Mindlessly responsive" -> When the content is outside the demarcated safe zone, it's not visible on little screens. Simple ruleset, no brain required. If I just want to get some fun content on a webpage, I either paint in the lines or intentionally paint beyond them.