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Well, this is what I would call a "curprising consequence",
but yes, I would say that
  (defmacro foo (&optional a b &rest (c d)) ...)
in effect makes a, b, c, and d all be required, else the parameters
c and d could never be satisfied.  You can get the effect you seem
to want by writing
  (defmacro foo (&optional a b &rest (&optional c d) ...) ...