AI tends to surpass human beings in an all-round way. Whether or not human needs can be met is a reasonable standard for judging something as good or bad. From a mechanical perspective, human needs include food, rest, etc. The book analyzes the satisfaction of human needs in history and emphasizes the importance of science and technology. According to the related analysis, human needs have been well met without advanced AI. Thus, humans should not be in a hurry to use AI in all fields. To pour cold water on overly optimistic people, it speculates on a potential authoritarian social structure without checks and balances in the era of comprehensive AI from a pessimistic perspective. AI will push ordinary people out of the job market and break the wealth chains in the market economy. Comprehensive AI is incompatible with the market economy and private property systems. The extensive use of AI brings about a reshuffle, may jeopardize the survival of ordinary people, and even cause societal collapse. Human societies are not ready for comprehensive AI. Therefore, humans must be cautious about comprehensive AI and not be blinded by immediate interests. Review and international cooperation on the use of AI are necessary.