Ugh... From what I understand, this is one of the new trends a lot of libraries are adopting. The district I work for actually had a planning company we hired at one point, to help us plan our next steps to expand and improve our services, who wanted us to adopt what would probably be a similar system- more like a bookstore, not a traditional library. This proposal was met with a *very* negative reaction from us library staff, and the company was fired.
As confusing as the Dewey decimal system looks on the surface, it's really much more practical not only for staff, but for patrons as well.