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I don’t think this statement is correct.For example Qt has been doing declarative with QML for years.

I generally agree with the OP except that lumping QML into the old-school GUI techniques isn't a proper fit. Traditional Qt Widgets, yes, but QML is indeed not far from the React-style of GUI programming.

> Traditional Qt Widgets, yes

No you're still quite wrong. QWidgets-based UIs still consist of a DOM driven by a state machine that handles events. UI files have a 1:1 correspondence with components and state machines still control changes to the widget/DOM tree.

But are widgets reactive in the way QML is? That’s the issue.

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