Going through the entire AT list as I write this post... and here's what I think should go (sorry for any duplicates, which will probably be most of them):

Controller:
This whole category.

Keyboard:
This whole category.

Game terms:
- Ability (we have "Job Ability")
- Auction (we have "Auction House")
- audience (no clue what this is for tbh)
- battle strategies (we have "What's the battle plan?")
- Campaign (we have "Campaign battle" and "Campaign Ops")
- Campaign Evaluation (we have "Allied Tags")
- Care (we have "Care schedule")
- checkpoint garrison (we have "Outpost")
- Confederate Icon (too Campaign-specific)
- Conflict (we have "Ballista" and "Brenner")
- Courser (chocobo breeds are just for flavor, they don't need to be an AT term)
- Destrier (chocobo breeds are just for flavor, they don't need to be an AT term)
- Fortifications (too Campaign-specific)
- Gordeus (plot-important but nothing really beyond that, unlike Astral Candescence)
- Heroism Gauge (too Campaign-specific. BTW for those who don't know, this refers to the gauge underneath regions on the Campaign map that refer to the potential intensity of the campaign battles held in that region)
- Immortals (we have "Blue Mage")
- In Conflict (we have "Ballista" and "Brenner")
- internal policy (wut?)
- Jennet (chocobo breeds are just for flavor, they don't need to be an AT term)
- Layer Area (wut?)
- Layout (wut?)
- Log (too... un-specific. We have "Woodworking" already)
- Mental (wut?)
- Mercenary Assessment (I know it refers to Assault rank, but I don't see why it needs its own term)
- Mercenary Rank (every Assault rank has its own term already)
- Morale (too Campaign-specific)
- opinion poll (too Campaign-specific)
- Outing (wut?)
- Owner (wut?)
- Palfrey (chocobo breeds are just for flavor, they don't need to be an AT term)
- Petra (too Ballista-specific)
- Physical (physical what?)
- Plan length (we have "Care schedule")
- Production (too Campaign-specific)
- Prosperity (too Campaign-specific)
- Quarry (too Ballista-specific)
- Rank Evaluation (not sure what this even refers to, but probably doesn't need to be there for the same reason as "Campaign Evaluation" and "Mercenary Assessment")
- Reconnaissance (too Campaign-specific)
- Rent-a-Room (with the "merging" of Mog Houses, this became a mostly pointless term)
- Resources (too Campaign-specific)
- Retirement (wut?)
- Rook (too Ballista-specific)
- Rounsey (chocobo breeds are just for flavor, they don't need to be an AT term)
- Runic Seal (unnecessary. Why have that there but not things like, "Burning Circle"?)
- Scout (too Ballista-specific)
- Skill (we have "Weapon Skill" and "Skillchain")
- skill (Campaign) (obviously, too Campaign-specific)
- Treasure (too unspecific. We already have "Item")
- User Glossary (doesn't need to be there)
- war climate details (good lord, too Campaign-specific)

Modes of Transport:
Can leave all these there, but would it help memory at all to simply put these into the "Game Terms" category? It's only three terms (Airship, Chocobo, Ship) and they don't really need their own category.

Titles:
Take out all the NPC-specific titles that players don't get. These include:
- Archduke
- Cardinal
- Chief
- Chieftainness
- Clerk
- High Guard
- King
- Knight
- Minister
- Musketeer
- President
- Prince
- Princess
- Shopkeep
- Theologian

Trade:
No removals, but a suggested change:
- Change the terms "Buy?" and "Sell?" into terms that make it more clear as to what the speaker wants to do, such as perhaps "Looking to buy:" and "Looking to sell:", similar to how "Reward:" was made to distinguish from the JA "Reward". It's possible that these terms are only ambiguous on the English client but have clearer meaning on other clients.

Organize:
- Are you alone? (come on, only creepers use this one)
- Let's try to keep the levels of our party members close. (usage of this pretty much died out with Level Sync, which in turn died with GoV)

Place Names:
- San d'Oria Residential Area (redundant. We already have "Mog House")
- Bastok Residential Area (see above)
- Windurst Residential Area (see above)
- Jeuno Residential Area (see above)
- Hall of Binding (too Besieged-specific and unnecessary. We already have "Astral Candescence")
- Open sea route to Al Zahbi (I'm sure not all the ship routes get their own AT entries, so why does this one have one?)
- Open sea route to Mhaura (same deal here)
- Silver Sea route to Al Zahbi (same deal here)
- Silver Sea route to Nashmau (same deal here)

Reasons:
- I'm sleepy. / I'm tired. (kinda redundant, get rid of one)

Online Status:
This one's actually an addition:
- Offline (well, if "Online" is there, why isn't this one there?)

Shops:
- Scrap this category and move Auction House, Chocobo Stables, and Vendor to the Game Terms category. None of the others need to be there, as they are far more niche and the terms are never used.

Fiends:
Nothing to remove here, but with extra memory space, please consider additions in this category, along with the obvious things like JA/spell names. These are commonly utilized terms for magian trials.

Equipment:
Honestly, this entire category can go. People use the specific names for an equipment slot or a specific piece of equipment that goes in it, not these generic terms.

General Terms:
This is a tricky one, because I know the AT system was designed to help foster communication, even when it comes to non-gameplay-related things. However, since we've long been at the point where the AT system cannot support all the necessary gameplay-related terms, I think most of this category needs to be on the chopping block too.
Terms that might be able to stay, either due to practicality or already finding extensive use by the playerbase:
- answer
- anyone
- anything
- breath
- character
- entrance
- everyone
- exit
- friend
- idea
- interest
- key
- language
- luck
- medicine
- plan
- all the skillchain names

Some people might say even that's too much. Regardless, a lot of it can be chopped off.

Game Terms 2:
- All the Campaign Ops mission names can go. There's no need for these all to be there when most other quest/mission names are not. If anything, maybe leave the ones there that require a group of 3 people to participate in.
- All the Union names can go. Too Campaign-specific, no one cares. If anything, just leave the term "Union" in there somewhere.
- "Maze" can be taken out. "Maze Mongers" suffices.
- Removing all of that pretty much removes about 80-85% of the category. The rest of the terms can probably be shuffled to more appropriate categories.


That's about it for now. Sorry for the length, but there is a lot of stuff that needs to be caught up on >_>