I can mostly agree, however...
Currency I don't think we need to expand the currency tab, I just think this stuff should be placed in the key items, or at the least key items should be expanded for this, IMO. It just feels like we'd hit a point where there is menu/UI bloat thanks to it, so either they would need to make a continual effort to condense down the variety of tokens, e.g., once an expansion has passed, just condense everything to a single book... or they need to think of another way
Dungeons, this is where to a degree I think they should be learning from criterion dungeons... Small knick knacks you can do through the dungeon to influence or provide some variance in mechanics.
Achievements - They already do have the achievement tokens, I just think they need to expand upon this system, more rewards, and a little more expensive. - I don't think they need to be fancy on milestones, they just need to provide more rewards through the token system. I mean, they could have an achievement for accruing x number of achievement points, which provides a title, but I would just prefer everything being funneled into achievement tokens, rather than feeling some sense of obligation, that I need to sit there and farm out levequests. At least with tokens you can largely pick what content stream you want to interact with for the achievements.
Criterion - Heavy disagree here, I don't think it needs removing, I don't think any piece of content should ever be removed. I think they just need to figure out how and where it fits in with the overall patch schedule, and the rewards need to fit within this. Probably also rework some of the systems that make it savage too.
Shared FATEs - Didn't really notice anything different. Felt exactly the same as it did in ShB, albeit with some more substantive grinds behind it, which I think is OK.
Overworld - Special FATEs? Yes, that already exists, e.g., Chi, Formidable, Ixion, Noctilucale, Odin. The only problem I would say is the frequency with which these spawn, they need to be much, much more frequent, but then in the same vein, much like Bozja, there is only so many times I can do Seeq and Destroy, or Where Strode Behemoth before it becomes a boring activity. In all honesty, the biggest problem with the overworld for the game is that they are trading convenience for activity, and life. Hunting/Taming job will only go so far before you eventually relegate it to something like a daily or weekly activity.