Harry Lee took Singapore from third world to first world. He created an economic order that every nation should imitate, and many have.
Singapore was about to fall to communism and racial violence, following the path of so many other third world hell holes abandoned by their colonial masters. Harry Lee created order peace, and economic freedom, which brought prosperity. As Spandrel says, he was a legalist, not a reactionary. Legalism, done right, brings order, peace, and prosperity. So, why would one need more than legalism?
In legalism, the great man decides what is to be done, then makes people do it. And then he dies, and the tide comes in, and washes away his sandcastles, however impressive they may be.