alt Hacker NewsSurely Amazon could invest in some form of support for niche case authors? Especially since there are not going to be very many legitimate "I have an enormous backlog of work" authors who aren't represented by a legit publisher.
Not saying there are zero, but if you're faced with a thousand scammers and one niche-case author... you go with blocking the scammers if you're serious about it.
The vast majority of authors are not represented by any publishers, and KDP is built around exactly those. The KDP limits does not affect anyone represented by larger publishers - only indies and small press (and genuine small press as opposed to imprints of larger publishers are few)