This is very interesting if used judiciously, I can see many use cases where I'd want interfaces to be drawn dynamically (e.g. charts for business intelligence.)

What scares me is that even without arbitrary code generation, there's the potential for hallucinations and prompt injection to hit hard if a solution like this isn't sandboxed properly. An automatically generated "confirm purchase" button like in the shown example is... probably something I'd not make entirely unsupervised just yet.