2. High-end cpu mainly lies in design. At present, China can't completely design a new CPU technically. Only design a part, and then copy a part to solve the problem of China.
3. In the design of high-end cpu, foreign giants have increased the protection of intellectual property rights, so even if they have the ability to copy and don't buy technical property rights, they can manufacture, but they can't sell and design infringement.
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In a word, China does not have the ability to design high-end CPU with new structure. This is equivalent to using China's electronic tube technology to design a brand-new electronic tube skyscraper. In terms of scale, this is an engineering project with huge human, material and financial resources, and it may not have the final result. If the state invests people, money and materials in research, otherwise no enterprise will take such a big risk to develop.
As for why the country has not invested in this development, it is not a question we can answer.