Meaningful openworld content. (GW2's meta events, normal events, worldbosses, hidden jumping puzzles, outdoor dungeons with more threatening monsters, GW2& Wow's enemies that go about their day and interact non-hostily with their own friendlies, and hostily with enemy/prey npcs GW2's and WoW's objects that can be interacted with that can change parts of the environment like opening up passages through puzzles or combat)
Design philosophies based around exploration and discovery. (GW2's hidden areas & collections, Wildstar's explorer and scientist paths that open up new hidden areas with shops or secret bosses, and uncovering lore collectables, Wildstar's plushie system where monsters of certain types have a rare chance at dropping a housing item that's a plushie of their type, Wildstar's tales from beyond the fringe system where you collect X amount of lore logs and you get a poster of that log series for your house)
Long running secrets to uncover and interact with (think the hivemind mount in wow).
Literally just wildstar's housing. All of it. It's perfect.
An option to turn on player speech bubbles so I can easilly see who is saying what without having to take my eyes off the center of my screen to my chat then back to the center of my screen.
Flavor skills that help you feel like your class choice affects you outside of direct combat encounters.
Languages! Having the chat autotranslate your text when you're speaking another ingame language, where if someone knows the language they'll read it as normal, but if they don't they'll see a made up language/cypher.
Bosses that aren't just dance memorizations that only test your ability to do your rotation while doing a pre-planned dance. I don't know how to describe this one that well. But basically I'm not a fan of how every single encounter in this game I can run through it in my head without having to touch a computer. Fights like NavCore, swabbie, volatility lattice, limbo infomatrix, hut hut, phagemaw, or Ohmna in Wildstar where you had teams doing one thing to support others doing another job were really cool and they never felt like I was just going down a list of mechanics that were coming up
Critters that roam the world and aren't designed to be killed, just little things that are set dressing :>
A /sleep or /grounddoze emote that lets you lay down on the floor anywhere. Other mmos have it. Not having it doesn't stop ERP from happening in this game. Modders have already found ways to pose their characters in lewd positions for screenshots. And even if they didn't, we already have /pushups, /situps, /playdead and outdoor objects in common leveling zones that react with /doze, so clearly that's not a reason SE cares about anymore for refusing to add basic emotes to the game.