You are changing your argument. Let's first agree that my point that being able to use standard APIs (dup,close,pipe,...) is elegant and avoids having a lot of parameter for a process creation call.
I don't think it's an elegant design at all; I think it's a workable design given the constraint of requiring fork.
It's an achievable result with less specialised parts, but there's a reason we don't write all of our logic in NAND gates.
I'm still only inferring what you meant by CreateProcess needing special facilities; I assume you meant opt-in fd inheritance. Saving a parameter call while forcing all fds to be shared/duplicated seems penny-wise but pound-foolish.
