Supposing it caught on... which do you think is riskier? Running an OS written in mostly memory safe code that somewhat might have tried to slip a backdoor in, or running an OS written in mostly memory unsafe code that has a long history of vulnerabilities and the Chinese almost certainly know about a vulnerability in.

If this catches on and has generally been subject to significant third party code review with positive results, I'm not sure any backdoor is lower cost to use than an equivalent linux vulnerability. To be fair, I'm not sure it isn't either.

You're wrong. A lot of Chinese code and hardware is in production in the west. Huawei networking hardware is widespread, for example.