There is far too much needless complexity in FFXI in the later endgame content.
It's really obvious that whoever was in charge of designing the endgame content for XI that was released in the past 5-6 years really loves being a seriously hardcore nerd, and they love making it as incredibly complicated as they possibly could.
For a new player, trying to wrap their mind around all the complexity of obtaining and upgrading Ody gear, or Sortie or upgrading Dyna D it's laughable.
If there isn't going to be new content, then work on simplifying the processes with what you have so more people can engage with it.
The process for getting r30 Ody gear alone is laughable, the amount of hoops you have to jump through, the requirements and unlocks etc is unmatched in any game I can think about. It's so bad that most people are just not going to engage with it at all, cause the mountain you have to climb to just engage with the grind is far too much. So you're going to lose players in the mid tier who cap out on the stuff they were doing, and that won't engage with this newer complicated content.
When most of the devs from XI moved over to XIV last year I can imagine the culture shock of being told this kind of content design isn't acceptable anywhere was mind blowing.
I cringe when I try to explain XI endgame beyond Ambuscade to a new player, it's designed by people who are very smart but have no understanding of creating things in a way that is palatable for normal people. I know many XI players take pride in it being the way it is (and many wiki writers gush over it endlessly, cause complexity is porn to them), but for new players coming from XIV it's just laughably stupid.