I won't be reading up on this later since I quite honestly expect to get flamed for every suggestion, but I'm submitting them anyways because let's face it, there's a lot of MMOs out there and from the ones I've played none of them have restrictions like FFXI has.
1) Remove the throttle speed for downloading FFXI, we're way past 56k modems now and 12 hours to download a game is unacceptable and would put most people off even trying it.
2) Make sending mail direct and not sitting in the outgoing mailbox. No other game has you waiting for someone to pick it up and half the time they don't even bother to check so it's just sitting there taking up space.
3) Remove 7 item limit off the AH or increase it to something like 20, some MMOs don't even have a restriction but those that do don't have it so low that it's taking weeks/months to get rid of stuff.
4) Remove the 200 fish fatigue. I get it, you don't want us standing in the same spot catching fish and flooding the AH with it. That's why some games I've played have a limit on when you can fish or where you can fish for x amount of time. One game had it where you could only fish at night game time, others had it where you could only fish in a spot for so long before the fish moved on to another spot but only affected your character, like in FFXIV. If you want to limit our fishing so we're not just standing there running a 24/7 fish bot then why not make us have to move, or adjust fish to only be present at certain locations and hours of the day?
5) Increase the fishing skill rate. It's weak. It's so ridiculously slow. You don't want us to catch more than 200 fish? Give us a reason to not stay in the same zone fishing then. I can gain several more skill points jabbing a level 99 mob with an onion dagger and no dagger skill in the time it takes to get 1 full fishing point. And not just the rate at which it skills, I've yet to see fishing give more than 0.2 points when everything else can give up to 0.5, what's up with that?
6) Please let us use trusts in mission BCNMs. I was like hallelujia! when I heard we could summon them in certain BCNMs, until my husband tried to do his rank 3 mission and couldn't do it because his trusts vanished. Now he's going off the game again because he can't progress and he's not the type for making friends or shouting for help in Jeuno, especially on a mission so trivial that people don't want to know.
7) Server merges! Need I say more?
8) Pet improvements. Moshis aren't good enough. Pet classes are still suffering with lack of interest because they just aren't good enough. All I ever hear is shouts for BRD, WHM or COR. Say you're a SMN and they don't respond, even for fights where the loot drops are for SMN! I've watched combat logs during delve mega bosses including summoners who had full 119 items and using moshi. All I ever saw was miss, miss, miss, miss, miss, and half the time their bloodpacts did mediocre damage that was below 500 points of damage. And as for enmity they're hopeless for keeping threat. The moment the summoner uses a ward-type bloodpact or a spell threat is instantly lost. Make us USEFUL besides just WKR please!