It's limited because you can't end up with a completely proper solution. Then you have to make a tradeoff between functionality, complexity and even performance

It's limited because you can't end up with a completely proper solution. Then you have to make a tradeoff between functionality, complexity and even performance for something as simple as the example I gave above. I think QML is an even better case for form-based UIs. Completely declarative, everything is automatically bound, what's not to like?