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Microsoft already has a Linux kernel. https://github.com/microsoft/WSL2-Linux-Kernel

If it were superior for containers, Windows containers wouldn't have withered on the vine.

.NET Core being truly cross-platform is pretty much an official acknowledgement by Microsoft that Windows is not the be-all and end-all. To use their words, they're "meeting developers where they live" instead of insisting that one size fits all, if that size is Windows.

This is an interesting claim, is there something I can read in support of it?

Having worked with the Linux OS APIs and Win32 APIs, they both seem to have their advantages.

Without a userland or application ecosystem how could one even say?

superior how?