Maybe I'm wrong, but from what Yoshi said I thought that the new dye system was something like an upgrade to the base item and the colored item has better stats for certain roles (as he mentioned the Cobalt Plate set and the Red Cobalt Plate set with better stats for tanking).
For exemple, I noticed that every tier of robe has two different colors, so I guess that one has better stats for healing and the other one for dps (or one is better for thau and the other for conj).

So, I think that there is a color restriction for gears and that also you won't chose a different color based on wich one you like, but based on stats, so actually you won't have any choice.

Honestly the new dye system seems easy and all, but to me it sounds like a huge step backwards in terms of customization, but I really hope to have misunderstood the whole thing.