I would like to add Lost Ark..i hyped that game for so much time....lovely physics details, character movements, skills impact...and questionable progression ruined it all.
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back to the topic
The first gen of MMORPGs was famous because online interaction was a novelty. They didnt have to do much stuff. A world free of critical bugs and open exploration was good enough to create a community able to have fun. Back in the day, manuals were popular in videogames, including not-so-complex single player ones. We can use Ultima as example.
The second gen tried to add more challenges, quests and some narrative. We can use WoW as example.
The third gen tried to add more complex mechanics in terms of combat. Later on, "3.1" gen tried to add naval stuff. We can mention Arche Age, Black Desert, Tera, C9, Vindictus.
FFXIV tries to be something between the second and the third gen with a classical japanese formula of instance everywhere and tight control over many of our actions (to be fair, Guild Wars 2 use instances too). Talent tree in FFXIV is just a dream, for example. Your character is not yours, to be honest, your character is its job. A black mage is a black mage, isn't person X black mage with a differentiated talents from other black mage because person X like this way.
I imagine the next gen of MMORPGs as something between FFXIV, Guild wars 2 and Lord of the Rings Online: open dungeons, strong optional narrative, epic music, open exploration, open world progression, minimal loading screens, respect for the trinity (tank, healer, DPS), classes/jobs identities are preserved, choices that affect outcomes in side quests...all while keeping instance contents relevant like we have now. FFXIV could learn a thing or two from Lost Ark. Right now, MMORPGs are just fine convincing people that they don't have to waste their lives to progress (creating casual friendly content), however, now they need to make it fun again.
Each famous MMO has a weird problem:
FFXIV - Open world doens't matter that much except for hunt, fates and initial stages of relic grinding. Loading screens everywhere. Yoshi P did an amazing job but FFXIV will be like this forever. We won't lose our invisible and weird walls or loading screens. Inconsistences in actions with weird excuses, for example: we can't sleep in our apartments, we can decorate our houses but we can't do much stuff except for gardening.
Guild Wars 2 - Strong open world progression, acceptable story, dungeons doens't really matter until fractals. Better combat than ESO. Inconsistent in terms of character design.
Elder Scrolls Online - Most immersive with choices that matters, interesting builds to create, epic lore. Limited combat and questionable monetization model.
WoW - Copy/paste of anything that works somewhere else.