As someone who has completed everything in eureka and bozja all I can say is this content put a bad taste in my mouth. Yes bear with me I did write an essay over it. I'm a salty baby crying on the forums.
The core problem I have is the goal as a player. In the other two you grind up for passive buffs while being able to play the way you wanted. There are bis picks for actions in both eureka and Bozja true but unlike in Bozja staying on those actions you enjoy in OC is an active detriment to your progression. I like the phantom jobs, I really do, but linking them to your phantom mastery means if I want to play the content I like I have to either not bother leveling the other jobs and potentially get passed up for Forked tower groups or suck it up and spend an OBSCENE amount of time to cap. The XP requirements for each phantom job are only as high as they are because se needs something to artificially pump up game time.
The content feels significantly more soulless as well. Not just the insane time investments needed but also how the content is run. There is zero downtime between fates and CE's. Aside from pot fates there will also never be more than one fate on the map either which boggles me given the low drop rates of the Demiatmas. In Bozja when I needed to grind rocks I just went to the appropriate zone and did fates there. Here it can be a half an hour before you even get an attempt at an Atma. Again designed to deliberately slow you down. There is no freedom of choiche in OC just push push push mindlessly into the SE approved fate for more than 24hrs of continuous game play to cap your jobs.
The fun of Bozja and eureka was to build the way you wanted, to choose the actions and pots you wanted to tailor the experience to how you want to play. In OC it is incredibly streamlined and restricted. There are no irregular potions for tanks, there are no lost seraph strikes for healers, only sub classes with predetermined kits. The whole point of a field exploration is to explore and break things by just messing around and trying out combinations that you find fun. I'll never forget how I felt when I read lost slashes description and tried it under inner release for the first time with nascent flash up on a large group of mobs. There is no exploration in OC only safe.
Eureka and Bozja weren't perfect but Bozja at least improved a lot of the systems in eureka and refined the endgame raid. DRS is still one of my favorite pieces of content in the game. Occult Crescent just honestly feels like a step back in terms of game play and was lazily developed so they could force you into spending more hours grinding out fates telling yourself, "I cant wait to play the content the way I want to when I cap my phantom mastery," rather than enjoying it as you go.