Except that hasn't happened. This is a response to Dems being unpopular for anyone that doesn't have a Reagan tattoo.
This stifles third parties and independents, forcing candidates to follow either dem or Republican party lines, both of which are deeply unpopular ideologies, thus lowering engagement and political choice.
Cool, read how the Chinese government works. There are hundreds of parties within the cpc.
It's a one party state in the sense you have to agree China needs to progress in order to hold office. Just like traitors can't hold office in the US.