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I think it is really cool how much of the CoreRT is written in C#. Garbage collection and stack frame walking are implemented, but most everything else is C#, including exception dispatch:

https://github.com/dotnet/corert/blob/master/src/Runtime.Bas...

and type-casting:

https://github.com/dotnet/corert/blob/master/src/Runtime.Bas...

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Yeah, that's what impressed me as well!

Turns out that even more components could be written in C#, but the ROI just isn't worth it, see https://github.com/dotnet/coreclr/issues/17576 for an interesting discussion

While it may have not fit their needs, the prior work in COSMOS suggests they could've done more if they chose:

https://en.wikipedia.org/wiki/Cosmos_(operating_system)

I also usually bring up Oberon and House given safe languages can handle low-level stuff if you turn off safety plus hide it in some module.

http://www.projectoberon.com

http://programatica.cs.pdx.edu/House/

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