One of the new features coming in Patch 10.0.5 is the ability to transmogrify Poor and Common quality gear. With this change, the white-quality pieces used to craft Shadowlands legendaries will become transmoggable in 10.0.5!
The base legendary pieces can be crafted by Tailors, Leatherworkers and Blacksmiths with enough skill on the Shadowlands versions of their respective professions. If you missed out on Shadowlands and are interested in learning how to craft these pieces, check our guide!