Yes: The 30 second separation in departures in the same direction was what caused the ‘safety’. No non-race aircraft in the sky of course. They were banned for the duration of the Race. Nobody else in the sky.
Departures at greater intervals in different directions would, presumably, be less ‘safe’?
I know you earnestly believe in this stuff Vag. Good for you. But your opinions are based on perceptions rather than experience in places where there’s real traffic density.