I understand what you are saying, but - the whole point of abstractions is to "hide state". For example, what is nicer to write/read? Pseudocode -

    // Stateful
    state = {buttonClicked: false}
    render() {
      if(!state.buttonClicked) {
        return button({text: "Click Me", onClick: {state.buttonClicked=true}})
      } else {
        return text("Thanks!")
      }
    }

vs.

    // Implicit state
    render() {
      yield button({text: "Click Me", onClick})
      yield text("Thanks!")
    }