Ultimately, the days of the single function distributor are over, unless there is a pressing physicality or specificity around the type of item being sent out. If you send out fragile embossed glass or giant lead lining panels, maybe you need specialist gear. B and Q need their own warehouse. But to build a new, automated and robot assisted warehouse at great cost and to only ship out … books … is misguided at best and unprofitable at the bottom line. Amazon will ship books and high value electronics as the same ‘thing’ so the big box warehouses like MDL and Ingram are now competing with a company that will ship a book, a pair of headphones and a new watch, all for free, and all from the same warehouse tech. Add to this that Amazon has metadata and reporting that allows its self-published authors to see Unit by unit real time sales and be paid royalties by the book if necessary, and the publishing big box warehouses have … old systems that spit out CSV files.