Taxonomists focus on content organization. UX designers on content experience.
“Despite their best intentions, user experience designers and taxonomy and metadata developers have often found that their work is not well connected, even though both are highly interrelated. For example, a design might be proposed that needs segmentation of content by user role, but there may not be metadata associated with content that captures the role, resulting in the need for detailed review of content and hand coding to create the experience. Taxonomists might build a taxonomy for roles without knowing which roles the design uses, leading to over- or under-specification of the taxonomy.”
(Carol A. Hert, Gary Carlson, and Bram Wessel ~ ASIS&T Bulletin, December 2012/January 2013)