1. Go-go-go Gameplay taken to the max. The optimal gameplay that everyone has devolved into is sprinting to a FATE, killing it in 5 seconds, returning, immediately sprinting to the next FATE, killing it 5 seconds, returning, sprinting to another FATE, returning and then sprinting to the CE.
There is no chill downtime with the gameplay loop, and the unlimited return function seems to only encourage this. The gameplay map seems incredibly small, as you're only ever sprinting to the same couple of FATEs, instantly returning, and teleporting to the next FATE.
2. Critical Engagements are poorly designed and courage Tank turtling. Get hit more than once on a DPS job and you're eating the floor, having no fun, and placing a burden on your teammates. Sure, it's a get good angle, but the actual reaction of the playerbase is for everyone to turtle on Tank jobs. You can get hit a couple of times on a Tank and shrug it off. Every CE is the majority of the players turtling on Tank jobs, or on a rez job.
The real problem here is the lack of defensive options for DPS jobs (aswell as my upcoming 3rd point). There is no Beast essence or something that will allow people to have fun on a DPS job, but stay alive. Even in a group with a shield healer if you aren't completely confident in the CE you're just going to die, and be a burden to the group. A Tank on their own is so much more safe than a DPS player inside a group with shield healers.
There are surprisingly few defensive utility with the support jobs too, most DPS will not be able to heal or protect themselves when they get hit.
3. Not being able to play with the support job/actions that you want because the gameplay loop requires you to swap support jobs to a new one to continue building EXP. Let's say I really like playing with Oracle. Too bad, I can't ever play with it because I need to level all of my other support jobs. You spend the entire gameplay experience leveling support jobs that you don't care about, instead of playing the ones that you actually want to play. There's also the hilarious thing of when you max out a support job, and get its final skill, you never actually get to use it because you need to be swapping to a new support job to level.
4. The complete destruction of the Eureka and Bozja gil economy. Why are all of the rare drops from Eureka/Bozja flowing out of random chests in Occult? It has completely destroyed the economy of both of them. It's like saying "We don't want you to make gil in Eureka and Bozja, only do Occult where you make no gil". Many of the rare drops and glamours from Eureka/Bozja tanked to nothing in value.