I'm fairly sure we had a thread like this not too long ago...

Anyway, as far as what would be my "Dream MMO"... Probably something like:

- Open World, with organic zones (I.e. Monsters move around doing monster things (Such as hunting for food, sleeping at night unless nocturnal etc), townspeople doing townspeople things). Throw in things like Rifts err... Rifts and GW2 events that can alter a zone too.

- No mounts, just seamless traversal similar to in Monster Hunter: World. So you slide down slopes, vault over small obstacles, swing on vines to cross gaps. Sprinting is a core function, rather than a CD.

- Modularized jobs. Something similar to FFIII where you can pick a trait from a job and use it on another one. Only expanded on. Allowing you to sacrifice a particular aspect of the job you're on, to slot in an aspect of another job you've leveled up.

For example, if I wanted to do 8 billion punches per minute, I can play a MNK and trade my Chakra system, for NIN's Ninjutsu and so get access to Huton and Greased Lightning.

Or if I wanted to play DRG as a Tank, I could give up the high damage combos and pick up DRK's defensive CD's and TBN.

- Combat system that is a fusion of MH:W and FFXIII with a dash of FFXIV. So basic combat takes the form of in Monster Hunter, where weapons and attacks feel weighty and basic filler skills come in the form of several base combos for the particular weapon type.

Add on top of that skills to use like in FFXIV (With the same controller support for them) which would also be designed to have some weight to them. With of course, new ways to aim and utilize them given the shift from tab target combat.

Finally, top it off with the Paradigm system from XIII, where each player can pick 2 of 6 Paradigm's to swap between during combat. Each allowing for different effects and skills to be available, with customizability of each paradigm via a "Talent" so people can tailor them to their intended role.

For example, the Sentinel paradigm might primarily be a Tanking based one with lots of self defense and enmity related talents, but it also has some party mitigation focus too, which a Healer or a Support player might opt for.

Or the Saboteur paradigm might primarily be a Support based one with focus on debuffing enemies defenses, but maybe a Tank or Healer might opt for it to debuff enemies offensive capabilities? Maybe a pure DPS might opt for it because it has some strong attacks to supplement their Ravager paradigm?

- Stats are actually meaningful. Not only are all base stats useful in some way to all jobs (Possibly through trickle down, i.e. Dex might provide some SkS/SpS. Str might provide some Det. Int might provide some Crit etc) but they're more customizable. Such as gear being mostly empty with only like 2-3 stats (Including Vitality) and the rest of its stats are obtained through adding Materia (With Materia scaling with item level of the item as opposed to being flat bonuses)

- Bring back funky spell names. I miss classics like Fira and Firaga. Especially when simply going from Stone I to Stone VI has such little actual relevance when all that changes is a slight bit of potency. (In some ways, it's nice that BLM has Fire I, Fire II, Fire III and Fire IV all with different mechanics. Though, why it couldn't be Fire, Fira, Firaga and Flare/Comet I haven't a clue...)

Outside of that, I think it's mostly just update and refine various systems seen in XIV.

Such as:

- All jobs on one character.

- Interesting MSQ. (Please, please, please no required group duties for MSQ. So that we can have non-duty content actually be worthwhile. For MSQ requirements, please use solo duties so everyone can easily complete the MSQ, while allowing for more cutscenes and more lore accurate encounters (I.e. If we're the badass "Chosen One" who single handedly defeats "Big Bad Enemy", then let us single handedly defeat them, not have to queue into a Trial with 7 other people to do it))

- Utilizing our job in quests. So our character responds to situations differently depending on what job we're using at the time is. (Also, opening up replayability in NG+)

- Hildibrand.

- Gold Saucer.

- Voice acting for PC's (With selectable personalities. So we can be super sassy, or more serious or a bit silly such as we see with some chat options now)

- Open world content scales with number of players participating, NOT how many people are in the zone. It's super dumb to have penalties based on other people existing in an MMO even if they're not actually helping with the content you're doing.