The only reason I began development on this is because of my own use case in which this style of UI suits perfectly. It suits so well in fact I'm entirely abandoning the classical retained UI which I've been using exclusively so far. I'm not claiming that this style is perfect for every or even most use cases, however from my own humble, limited experience I'm yet to come across a use case where I'd prefer to go back (I'm well aware that these probably exist).

Re pixel positions: Tooling is planned for easier widget placement... As I mentioned in the article, the project has barely had three weeks worth of work poured into it - perhaps it's best not to try and declare the project as useless when it's barely even out of the womb ;-)