Lol the gear part makes me really wonder, what I'd love to see is some more fair choice / build options (would promote horizontal play) and less stuff like accuracy. I find accuracy to be a very boring stat, get so much until you don't anymore and then you avoid it like the plague as it is basically just a gear killer and for those who don't pay attention to it just a very annoying combo killer (tl;dr, try to pay attention to accuracy until you don't, and all it offers is that you do something that everyone takes for granted already ~ lol). Enemy evasion should be based on mechanics only, imo. Like blind changed from % chance to X number of times, dodging being a mechanic and not a chance, can leave it alone against monsters though (player spells onto monsters).
I'd like to see accuracy nixed entirely, but I'd like to also see some stuff like in FFXI & even WoW, or heck Diablo 3 lol. If they don't want to make horizontal ilvl growth they could make it so the special abilities on items can be extracted, just add a few more QoL to materia system and that shouldn't be too worrisome (and make it so only one ability effect per item so you couldn't take an ability from three other items and materia it into one item that already has one). I think it's silly that there are many contents where you have to run it but you want none of the gear they offer (except for glamour/log) because the next step invalidates it all, like the next step 10 minutes away - I'm not talking big level jumps and stuff that of course makes sense.
WoW has sets (special effects), items with abilities, gem relics (materia with abilities basically), and enchanter (some abilities, some pure stat enchants), as well as trinket slots that are dedicated to this idea of items with abilities (so multiple opportunities to see "special effect" stats). FFXI obviously had special effects even. D3 is a harder comparison (different game style) but the legendary are pretty fun, albeit you quickly go from 500 options to 3 once you get near the end game / difficulty level (better than 1 imo, but you can't do whatever at the end - easily can do whatever in casual content though and it's a lot of fun).
Of course meta can narrow down some of the usefulness of effects but usually only matters in the harder tiers (like savage you'll need more specific answers, but a normal mode dungeon could be more free).
Still praying they'll make instanced housing.. Of course would like to see an Ishgard theme but you could do that in another system too and allow players to be more creative/wishy wasyhy friendly. I want snowflakes today and rainbows tomorrow! The current system makes you have to bleed yourself out before you could switch, and that's as they add hundreds more houses to servers that don't need them and missing many thousands of houses on bigger ones. There's no balance xD.