For those of you who were wondering when Final Fantasy XI started supporting add-ons… it didn’t. The game has never supported add-ons, and using Windower and its associated add-ons is totally not allowed and could get you banned. Except that it won’t, and functionally no one is particularly concerned about it. So you have players who use the software and its various functions to do awesome stuff like turn the game’s interface into the interface from Final Fantasy XIV.
Obviously, it’s not a perfect translation; FFXI is a very menu-driven game and FFXIV is not, there are lots of different mechanics at play, and the hotbars alone are a rather experimental bit of additional coding. But it’s pretty neat to see the older game gussied up to look like its newer cousin. And if you want something to slightly ease the adaptation curve, you could do worse.
This is what add-ons exist to do.