Mixed economies have the disadvantages of both government central planning and weak capital investment. Either economies are free to develop and grow to the fullest as as the market dictates, or they are constrained by government by various degrees and variously tepidly plod along.
It's clear to most of the world that centrally-planned economies will fail; what's not so clear is that "state controlled capitalism" is also destined to fail, but at a slower rate. There is no such thing as "state controlled capitalism," as Capitalism, by definition, implies a Free Market. Either the economy is free or it is not.
Economies, like religions, must be free from the government, because government, through its politicians, always perverts a country's economic resources to its own ends, fostering corruption, while disallowing the people who earned it from benefiting from their own labor and investment.
Although the economic growth of China has been fantastic, it would be even more so if the government would allow its citizens their personal and economic freedoms.