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I'd say OO still does rule the GUI space. The various reactive programming GUI tools are still struggling to reach the levels of complexity of UIs that were already common place in the 90s. Functional GUIs have their own problems with giant balls of state that makes composition difficult. So we break it down into smaller bits and it starts to look like objects again.

IMO the functional GUI push has less to do with functional GUIs being superior and more about dealing with the piece of shit that is the DOM. Native environments that don't have to deal with the DOM don't get the same benefit and have new problems that are solved by more OO approaches.