I think you have it backward? Although to a certain extent, books have lasted so long as a technology that the two meanings have become intertwined. Movies use

I think you have it backward? Although to a certain extent, books have lasted so long as a technology that the two meanings have become intertwined. Movies used to come on VHS tapes, now they come on DVDs or via streaming. Music used to come on 8-tracks, then cassette tapes, then CDs, now streaming. Novels once came as scrolls, perhaps, but still mostly come as books, although now often ebooks. Non-fiction writing also mostly comes as books, and I suspect non-fiction ebooks are a smaller percentage of overall non-fiction sales than that of novels.