We really need to stop assuming just because X game does it it can be easily applied to FFXIV.
You do realize FFXIV uses a custom made engine right? so no. it can't be easily copy pasted into a completely different game engine.
Cute that you are that naive. I used to play an online game where you could customize so much stuff. each piece gear had at least 3 dye channels. It was a sandbox game so there was a lot of horizontal gear progression (well honestly all heavy / light / cloth armour had the same stats until the devs decided to power creep something which was usually hellish to get). Same thing applied to weapons so basically you could wear whatever you wanted and guess what. EVERYONE STILL WORE THE SAME STUFF DYED WHITE OR BLACK. You need to understand something. Humans are mostly sheep.
You can see in the glamour department even though there is some choice the most popular are always the same basic sets.