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They use those "obscure __identifiers__" because they are reserved by the standard and thus a conforming program will not define macros with those values and break everything.

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IMO a better approach would to define some way for compiler to undo all defines before standard header is included and redo those defines afterwards. Or just to stipulate that standard headers must be included before other user code.

With modules, "hiding" code like that will be possible in C++.

If only we could skip forward a decade and get mature implementations of it right now...

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