It is not a failure concept. The interesting fact is that Zumwalt failures were created by the American media system.
1 The United States tried to exaggerate the Type-055 threat, claiming that the Type-055 was a cruiser because it was> 10,000 tons, but the Americans tried to avoid applying this logic to Zumwalt.
Zumwalt is very dangerous because it is stealthy, can bombard enemy coasts, can also strike enemies with long-range missiles, it is also anti-submarine and has anti-aircraft capabilities.
2. Zumwalt's construction cost was not ridiculously expensive (several billion USD each) and Zumwalt's Shell was very cheap, but the US media claimed it was up to 1 million USD per one.
3. During the development of Zumwalt, the United States gained a lot of experience and created a lot of new technologies that are applicable to future generations of warships.
Sure. Zumwalt is not a failed project. The Americans have other plans. Not coincidentally, they are trying to deceive the world, downplaying Zumwalt's capacity with so much negative information.