I spent some time exploring Glamorous Toolkit [1] for agent-assisted custom UI development, in an emacs fashion, where you'd modify the interface you're working with on the fly. It was a pretty good experience and the built-in data exploration was top notch.
Ironically after watching glamorous toolkit videos on youtube, I was recommended a talk by Geoffrey Litt about dynamic documents [2] and at the end of his talk I learned about bb [3], which has much better agent integration compared to GT. Like @thelazydogsback said, with agents, the programming language matters less.
I was talking at around a year ago with Tudor Girba and asked him what is his opinion towards AI---I somehow believed it to be conflicting with his world view, but then he showed me some amazing demos of llms walking inside of the GT, making tools and molding it. It was way before these new agentic plugin-based IDEs.
I think Girba's really amazing idea of "language = ui = software = data" has a huge win in terms of AI that is not used anywhere else (maybe only in Chris Granger's Eve), but to work with data and build live on it, is something way better than BB.