Love Elden Ring, the esoteric nature of the game is part feature of that world certainly - I think a smooth UI that doesn't aggressively cloud your gameplay is also nice (those meme's of the screen full that came out after Elden Ring did well), that said there is a lot more going on in FFXIV than Elden Ring. You've got a boat load of people doing things of importance, chat whizzing by, and a boss throwing out a multitude of relatively strict mechanics that Elden Ring doesn't really have. Of course you need to git gud in the game, but there is far less stand here while facing the wall before you turn around and ram your tether into your friend's face while also watching your 20 skills and if anyone died so you might raise them.
Because of that I believe you cannot have an esoteric / hyper minimalist UI like style and be any good to the masses. Naturally some might like it, of course some might like the meme screen full image as well- I've seen addon screenshots of WoW that looked pretty much like that. To me I think it's trying to pack as many feature smooth options as reasonably possible (new menus for the sake of it isn't helpful, but it could be the difference from 20 seconds of wasted time each day and thus such a change may be valuable). For example the current gardening UI and seeds usually takes about 30 seconds extra, imo, for no particular reason, it could help identify what I've planted or what seeds I have via better icons but it doesn't so you get to highlight it all to find what you're looking for unless you know it's an herb vs fruit type situation and even then that's not enough info to know without quickly highlighting them. Or a bit decisive example but having PvP combo would actually allow you a smoother more minimalist experience, and probably /closer/ to an Elden Ring comparable, even though I imagine some people would try to use the git gud narrative to suggest that condensing cooldowns is for scrubs (yet again in Elden Ring, and like games, you hardly manage as many things as you do in FFXIV, or even say a MOBA which is only 5 skills usually lol).
So I agree with Aniya, and I do want to say there are great points to Elden Ring not bloating UI but beyond the point that FFXIV functionally just can't do some of that (how are you to represent a raid without showing people what's going on? press f to pray people have hyper awareness lol), also.. in some situations I'm not sure the success of Elden Ring is 'because' of some decisions but in spite of it them (fantastic open world with great environment and dungeon content design with great combat, insane amount of content). Like I don't think 'not having a quest journal' is an achievement or makes the game any better if not worse. For example that was rather annoying and I used third party websites to which felt like a requirement in order to fully enjoy the game because I found lack of quest tracking very annoying and high chance to waste my time to experience the game if I didn't use them (but the rest of the game still fun). Strong imo but a journal would improve Elden Ring, even if it didn't tell you exactly where on the map- more like on cRPGs where you had a literal journal for events.