I think the idea is that this is for people who have learned the code to structure a webpage, but are sick of fiddling around with CSS/LESS/SASS to get a certain div in exactly the right place.
Agree, it seems like a complementary tool for people who know how to code. I also would have loved to have this tool a couple of years ago to help explain certain concepts to my boss (an HTML/CSS naysayer), i.e. 'these are the kind of layout things that can be abstracted'.