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Constructing a FontSpec in platform-independent code is awkward, because you can't call fontspec_new() outside the platform subdirs (since its prototype varies per platform). But sometimes you just need _some_ valid FontSpec, e.g. to put in a Conf that will be used in some place where you don't actually care about font settings, such as a purely CLI program. Both Unix and Windows _have_ an idiom for this, but they're different, because their FontSpec constructors have different prototypes. The existing CLI tools have always had per-platform main source files, so they just use the locally appropriate method of constructing a boring don't-care FontSpec. But if you want a _platform-independent_ main source file, such as you might find in a test program, then that's rather awkward. Better to have a platform-independent API for making a default FontSpec.