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

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.