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Retailers should (must is maybe more appropriate) display this information, as it's needed by consumers. It's also important that the metadata is made available to libraries and other institutions. Keep accessibility features enabled! Don't disable them either deliberately or inadvertently. It's important to code that "this book is fundamentally inaccessible" if it is true, especially if you're disabling accessibility support intentionally. Be clear upfront so readers and consumers can get to the right book.