Here's an input:

01) Make the UI even more flexible: let us move HP/MP/TP bars separately... let us make a narrower target's health bar. Let us have the option to diplay our buffs 1st on the party frames and let us have the option to change the width of those bars, and even... having the option to only display MP or TP bar according to the job. I'd love to have a more compact party list, but it's simply not possible with the amount of stuff there. Honestly who wants to track a MCH's MP?

02) Revamp the "role action" system. It works... but it's a bit meaningless. As of now, there are many useless skills there and honestly the few ones that are vital could just be baked in the job's actions. Give us back a revisited cross-class systems, allowing us to have again basic skills from other classes (not jobs) for situational / solo utility.

03) Make the glamour dresser a thing that can store all appearances from our items. 200 limit is really nothing for a completionist. Let the armoire appearances be account-wide!

04) Create armor with 2 dye channels! Sometimes it's really underwhelming when you're trying to make a set colorful to find that only a tiny spot of the item is dyeable. Or in opposite, everything is washed in the color to the point that sometimes the original item is more interesting. I know it would be a huge undertaking to change armor retroactively to add that, but at least add for new ones.

05) I won't advocate for additional character "sliders" because that would require a lot of effort... but instead give us many more face options. Honestly, a race having just FOUR faces is really limited, especially in this game where you are constantly staring at our character's details. Make height slider a bit more intense (right now isn't that much noticeable). Also add more facial feature options and let us stack 2 or 3 face paints.

06) Let us change the nameplate font size! Oh gosh, I actually have to turn off the friendly nameplates because sometimes it's too cluttered on the screen