The old one didn't make sense because it's saying "no one has done what we're doing **because** this requires building from the ground up without being coupled with the DOM". Anyone could have done this, but no one *has*.

I think what we want to say is that "no one has done what we're doing, **which is** building from the ground up without being coupled with the DOM", and I felt that by this line, we already hammered into the reader what we're doing. I can bring it back, though.