My experience has been that DSLs don't scale well. They were an albatross with Chef just as they were with QML and Slint. With both Slint and various Qt bindings for Rust marshalling data between Rust and the UI is painful. With Slint you get the added bonus of things just not yet existing in the DSL. That's a result of both immaturity and a strong focus on mobile at the expense of desktop. Here's a more idiomatic version of the previous example. IME gpui (and iced) is a lot easier to extend than something with a DSL, and if you check out the gpui example you'll see that gpui provides convenient methods to get consistent styles vs the Slint example where you hardcode widths and sizes.

    use gpui::{black,red,green,blue,yellow,white};

    let Self{text,..} = self;
    
    v_flex()
        .gap_3()
        .bg(rgb(0x505050))
        .size(px(500.0))
        .justify_center()
        .items_center()
        .shadow_lg()
        .border_1()
        .border_color(black())
        .text_xl()
        .text_color(white())
        .child(format!("Hello, {text}!"))
        .child(
            h_flex()
                .gap_2()
                .children(
                    [red(), green(), blue(), yellow(), black(), white()].map(|color|
                        div().size_8().bg(color)
                    )))