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US targets TP-Link with a potential ban on the Chinese routers
(www.theverge.com)
This is a most excellent place for technology news and articles.
The examples you gave are all at the OS level and installing OpenWRT would fix them. The firmware/BIOS level is much more custom and can be susceptible to attacks the OS is completely unaware of (effectively pre-installed rootkits). Hence why I mentioned it may not be enough to install OpenWRT.
Yes of course, you're right. The point I'm making is that wherever you're putting in backdoors, instead of backdoors, you can just leave unlatched vulnerabilities. Gives you solid plausible deniability.