IIRC they were working on an item log and they determined it was too much and so they took some of that info and put it into their lore book. Would love to see them go back and try it again, for the the reasons you listed (glamour, minions, mounts, etc). Or it was an amazingly vivid memory that never happened lol.

Either way I think it would be really cool to have a better logging system. For a while I've really wished there was some sort of faded green checkmark background on items you've obtained before that are like mounts, music, minions, and could be for glamour too if they added a transmog like system.