It is neat for sure, so are using appventor (blocks to build android apps)[1] and other shortcuts to build websites and apps.
The problem is that it says simple, while talking about Git for goodness sakes; commit permissions and such. It says no code. I disagree... you need to know HTML basics to even comprehend the Mavo way.
Why not just make a vanilla HTML page if that is all you need? HTML is not hard... and how is this moving us past CRUD?