On Thursday, the National People’s Congress convened in Beijing in what has become a familiar annual ritual. Some 3,000 “elected” delegates from all over the country—ranging from colorfully clad ethnic minorities to urbane billionaires—will meet for a week to discuss the state of the nation and to engage in the pretense of political participation.

Some see this impressive gathering as a sign of the strength of the Chinese political system—but it masks serious weaknesses. Chinese politics has always had a theatrical veneer,...