I think at the time it was extended, it may have been useful. Today technology and so many things change so quickly that something (technology based) manufactured and copyrighted even 5 years ago is almost useless when compared to modern technology. Faster processors, more memory, faster refresh rates, faster read and write rates, higher power cameras in smaller devices, and so on.
I do believe that as far as US copyright goes for technological, it needs to be cut in half effective for all works and items created after 1990, and most everything else set to death + 10 years OR 25 years after creation, whichever comes first.
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