I suspect the argument some folks might have against a glamour log is that, right now, if you have a specific piece of gear you always dye a specific (potentially expensive) color, you can dye the gear and put it into the glamour dresser, and then the dye is just preserved any time you put the time onto a glamour plate. Like, say, how I have the Replica Sky Pirate's Boots of Aiming dyed jet black like 75% of the time that I use them; as a result, I dyed them jet black and put them in the glamour dresser that way, so I don't have to use a dye every time I use them on a glamour plate (unless it's that 25% of the time I want to use them in a different color).

Whereas if it were just a glamour log where it was a simple achievement, you'd have the ability to pick any piece of gear that had passed through your hands... but it would presumably be the default color, and force you to burn a dye again each time you stuck it onto a glamour plate.

Personally, as someone who has a Serious Glamour Inventory Problem (send help), I really do wish we had a glamour log system, and I'd put up with the inconvenience on the dye side of things. But I can also see places where some folks would find it disruptive to how they handle their glamour.

(And "just let people pick any color and do away with consumable dye so it doesn't matter" is, I suspect, not a thing that would fly given that they sell some of the more obnoxious-to-obtain dyes on the Mogstation.)