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The first version I wrote *did* automatically invoke shlex.quote on all interpolated values, but that breaks wildcard handling. You can see that in the examples I posted above. With the default whitespace escaping (which allows spaces in filenames), wildcard matching still works (thus the list of directories matching the "../py*" pattern), but with full quoting it breaks (thus the "nothing named '../py*'" result).
So I figured the simplest default was "you can have spaces in your filenames, but otherwise you can do what you want". Now that I have the 'unquoted' conversion specifier, I'm open to tweaking that scheme to allow the same chars that shlex.quote does *plus* specifically the wildcard matching chars (i.e. '*', '?').