1) Glamour log is first priority, but we know how that's historically gone.
2) Eliminating the whole dyeable vs. non-dyeable notion as well. It was really stupid/awkward how that was handled for the ARR artifact armor in particular and just serves to bloat the total number of items unnecessarily.
3) Merging other variants of the same set in some way would be great as well.
4) Enhancing dye options with multiple channels would be amazing. So many pieces of gear that accept dye only over a small portion resulting in an appearance that still isn't what you want. (Crescent Moon Nightgown is especially bad about how it's dyed, for example, as the gradient will always start at white. The new Faire gear is another example though as the leggings remain white regardless of dye.)