What am I missing?
Unobvious benefit is a requirement for ALL patents ...
""Section 101 of the U.S. Patent Act sets forth the general requirements for a utility patent:
Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvements thereof, may obtain a patent, subject to the conditions and requirements of this title.
In other words, for an invention to be patentable it must:
be statutory,
be new,
be useful, and
be nonobvious.""