If you had a magic wand and could add three things, what would it be?

[Avoidy]

Alliance Raid (Unreal)
More long hairs and long ponytails, clipping be damned.
Voice acting and dynamic hildibrand-esque animations for every quest.

[Astrahime]

1: Remove Easy/Very Easy from MSQ instances unless playing through NG+, and remove role-based tank busters.

2: DMCA FFLogs and prevent specific-job lockouts in Party Finder - and also either prevent people from setting the required IL above the current maximum or make it so that PFs that are above the IL of your current gear don't show up similarly to how duties that you haven't unlocked yet have the [Locked Duty] message.

3: Make Deep Dungeons/V&C Content/PvP give meaningful rewards.
3a: Deep Dungeons. I like them, but a lot of people don't. It doesn't help that HoH only had one weapon, and EO requires you to give away 9 Aetherpool Grips (aka almost all of your in-orthos stats) just to take away a weapon that was as good as the current EX weapon. PotD let you get one for just 3 Aetherpool grips, and when 3.4 released you could use another 6 to make it just as good as the EX that just released.
3b: Materia isn't content. Give us unique accessories, or a way to buy Tomestone Upgrade Items without waiting for an odd patch first. "Causals" are already locked out from getting BIS because they can't run savage, so at least let them get a time-gated way to upgrade the time-gated gear that they think is the best they can achieve. Or maybe, given the fact that the only reason other than pure masochism that players play Ultimate Raids is to get shiny weapons, give players GLOWING ACCESSORIES by completing Criterion Savage. Additional melding slots that 8man savage doesn't have is optional.
3c: I'm not asking for completely new gear sets like there were in Heavensward, but MATERIA ISN'T CONTENT and the price of buying materia with wolf marks is an absolute joke. The only reason that anyone other than the most diehard PvP fans play PvP right now is because we have a battle pass, and the daily bonus for Frontline.

[SeriousPan]

1. Take Crystal Tower Raids back to ilvl 110 tops

2. Blitzball

3. New glamour rules. The job identity concept died a long time ago.

[Rolder50]

1) Change glamour to be a system where you just unlock appearances and can use them without having to keep the item. Remove the dresser and have unlimited glamour plates

2) Instanced housing.

3) Make healers fun again. (Various options exist for this)

[Cidel]

I'll be a little conservative in my wishlists: things that I think should be feasible without upending too much:

1) Continue to develop our squadrons. I get they are dead-set on the Trust system, but I would like to use my customized, glamoured NPCs instead beyond whatever the last (Heaveasward?) dungeons were. They are old content, what are the devs afraid of breaking? We also are overdue for Hroth and Viera squadron recruits as well.

2) BLU in PVP. BLU can be balanced for PvP. Every job has a scant amount of hand-picked abilities and the mode is largely role-agnostic (for most baring a couple healers or tanks). They can pick a few balanced DPS spells and utility support spells/abilities for BLU and let it participate in PvP modes.

3) For the love of the Twelve, if a BRD is holding a weapon with a bow attached to it, let them strum on that instead of whipping out the hammerspace harp. It's incredibly redundant from a design perspective. The original BRD Miqote in AF from ARR is even seen in promotional material "playing" the relic bow. I don't know how much resources it would require for the system to identify if you are using/glamoured a bow with a harp built-in and let you hold it up for a moment to strum on that for each song. It's like giving NIN two blatant boomerangs for a weapon when they never throw them for anything.

[Renalt]

1. Get paid

2. Get laid

3. Gatorade

[Zanarkand-Ronso]

1. Get paid

2. Get laid

3. Gatorade

Now thats a Haiku I can Get behind.

[ForsakenRoe]

1: reworks to healer rotations so we don't press one button for over half of our GCDs in a fight

2: glamour catalog so we don't have to worry about dresser space limitations anymore

3: engine revamped so everything is more responsive, and with it, a change to DOTs/HOTs so they tick every 1 second instead of every 3

[Nebelheim]

1)Horizontal gearing with various gear bonuses for wearing a full set of a specific gear.

2) A subjob type system/feature similar to ff11.

3) Rework how jobs play back to how they did in stormblood

[glitteringcosmos]

1. Ranger job (a bow or even crossbow-centric job that's not tied to music)

2. re-done English voice acting for ARR with the current cast

3. Some of the cut ARR quests, like The Warden Works in Mysterious Ways/the deleted sylph quests. Not all of them, just the ones with fun lore bits.

edit: changed my mind and changed number 2, the original was instanced housing