The cosmetic threads feature has a more robust architecture so that they behave more consistently. The improved behavior provides more stable references for edges and faces, along with correct parameters for assemblies, drawings, and graphics
Also Improvements include support for tapered threads, mirrored and patterned geometry
And many issues have been resolved related to how cosmetic threads are created, updated, and displayed when there are child references in downstream features.
SolidworksSolidworks 2019 Beta