Disposing of books bequeathed by a major historical figure, with that person’s underlining etc., is not routine collection management. In my own location, I would expect such books to be moved to closed stacks, or perhaps moved to the national repository library, but not dumpstered.

Also, disposing of books when there are not actually space limitations, in order to create the supposed library of the future that has few books, is so new a phenomenon that it shouldn’t yet be called routine. Objecting to this trend is still very much appropriate.