> Defining all 4 screen sizes gets tedious. I've got to disagree, I think just having to add col size classes to divs to change how it's laid out on mobile/tab

> Defining all 4 screen sizes gets tedious. I've got to disagree, I think just having to add col size classes to divs to change how it's laid out on mobile/tablets/large monitors has helped tremendously, with 2.x it felt like we just had to hope it all worked out.