The only compelling reason is to give broader and cheaper access to past works. If you don’t find that compelling then I don’t know what to tell you. What’s the compelling argument for them to exist as is?
The big extensions came in the mid-70s and late 90s, well within living memory. According to your own link they nearly doubled the average duration and pushed it over 100 years.
The big extensions came in the mid-70s and late 90s, well within living memory. According to your own link they nearly doubled the average duration and pushed it over 100 years.