yeah, predefined actions for often used features is good (if you assure that it would be possible to add some custom JS action if needed), but frankly I think this project could be better (I mean, really better, it would be killer app), if you would go further and made visual editor for that. Some sort of modern WYSIWYG. Nobody wants to edit manually plain JSON files... But if editor could let you to make apps without code and generate/modify these JSONs for you, it would be nice.

I think data-driven approach is huge win for that. It's all data after all.

What is the problem? Creating visual editor is hard. Idea is obvious, but implementation, ux etc. is hard (I see sometimes visual editors for apps and most of it are sh*t).