It can be binary but it isn't.
If they change it to be binary we need dedicated dye storage, or better yet, have players unlock dye transmog style so I'm not hemorrhaging scripts rebuying pearl white and gunmetal black dye.
It is useful to me.
I have some pieces with similar thumbnails and use the HQ sparkle to tell them apart without having to hover over them.
I have HQ gear I glam with that I also remove and use as I'm levelling other jobs.
It's not a major point but it's not useless.
