Their govt controlled economy has excelled all others in the history of the human universe in the past thirty years. Worth thinking about.You are wrong.
The market controls and interference by the gov, will have long term consequences and are almost guaranteed to precede a crisis.
The stock market will have no major role in a China crisis. A collapse in property/infrastructure units is where a crisis will most likely come from if it does occur due to rampant overspending and theft by local governments. But China has so much foreign assets and the govt much more control over resources and banks, rightly or wrongly, that it's almost impossible to see how a big crisis could occur in the absence of utter stupidity on the behalf of policy makers.