Parent's point is not some abstract personal value problem.
Think about public libraries. They have limited space and budget, and already abundantly hold loved classics. They'll still take in some amount of new books, but when a 8 yo kid goes in to decide what to read, the vast majority will be older books.
I visit libraries wherever I go and that's not true anymore, outside of university libraries. The average municipal/county library is almost entirely books published in the past 15 years. Most classics have to be procured through ILL, if they're even available then.
Think about public libraries. They have limited space and budget, and already abundantly hold loved classics. They'll still take in some amount of new books, but when a 8 yo kid goes in to decide what to read, the vast majority will be older books.