Yoshida states that this was one of the major causes of 1.0 being the failure it was. In short they had too much confidence in their own skills and in knowing what players wanted best that they simply did not look at the market around them and decided to make the game based in their own feelings of what was best.
On topic: I'd love if they implemented a transmog system like WoW, where once you get a new piece of gear you save her appearance on a wardobre, no need to have the gear in your inventory.
It would also be good if they added some longevity to ex primals, I mean... You run the ex primals 6 or 7 times, get your gear and then have no reason to come back there ever, other than the mount that is either super rng or super grind.