Since he embarked on the Barnes & Noble redesign in 2020, Mr. Daunt has demonstrated that consistency doesn’t rank very high on his priority list. New York City has nine Barnes & Noble stores featuring four different logos above the front doors. A lot of brands benefit from uniformity, knowing that your coffee or burger at Starbucks/McDonalds/wherever is functionally the same in Tokyo or Toronto. I think book stores…
If nothing else, uniformity doesn't add as much value to a brand that isn't selling its own product. Nobody really worries that the copy of a book they buy in one shop will be different to a copy bought in another. There are likely some benefits to consistency, like a familiar store layout or knowing that a shop will stock a good range of books, but these are kind of ancillary to the product (and my experience is that these things aren't that consistent across big chains anyway).
There is a great book shop in Dublin, Ireland called Hodges Figgis. It was bought by the UK chain Waterstones in 2011, but you wouldn't know it - they wisely decided not to interfere at all with such a locally beloved brand.