People outside China should not use an operating system from China. This is a national security risk. Just as long-standing exploits are found years later in Windows, Linux, and even Cisco hardware, holes and exploits that are known to the Chinese government can be buried in any of the Chinese equipment or software without being found by researchers in other countries.
China can, and we should assume will, use these to gather information on people in other countries, use them to deliver malware to other systems on the network, or have it as a trigger where they can crush the communication infrastructure in other countries in the event of a conflict. Hopefully, none of these will ever matter or happen, but because of the risk, unless you live in China, you should avoid Chinese tech devices and software, especially if you live in a country known to have a potentially adversarial relationship with China, like the U.S., Taiwan, India, and other such countries.