Rationality has to be guided by common sense. I’m sure Nazi Germany had many extraordinarily capable technocratic leaders but we have those in ample supply and with the computers now reasoning with us I don’t think we need more of those. Rationality is a solved problem as far as I’m concerned. We have other issues. We lack a coherent moral vision, societal cohesion, stability, sanity. Once you lose those it doesn’t really matter what system you implement, it’s just delaying the inevitable.