This is really the issue with all content in general. If we get a new deep dungeon, it's just a visually reskinned Palace of the Dead. If we get a new exploration content, it's just a visually reskinned Ishgard Restoration. If we get a new field operation, it's just a visually reskinned Bozja - the fight mechanics are different, sure, but the only creativity is in the fight mechanics and visual design, not the overall mechanic design.

To get really creative with a field operation for example it would have us dive underwater in a large sea, risk getting sucked into a whirlpool, have a quest to race a mermaid into a cave where we have to hit all the speed boosts and avoid the whirlpool in exchange for a mount, and introduce underwater fighting with 3-dimensional telegraphs. Then have some elite bosses to fight solo underwater as well. Then have some FATEs that involve using ship cannons to fight another ship (think the visual look of the latest alliance raid), and a section of the ocean that transports us to another dimension to fight a boss (if we go through the middle of the Bermuda Shades Triangle).

But there is never a lot of mechanical creativity like that. There is only creativity amongst the music, visual appearance, and fight mechanics; everything else is mostly the same.

However, the new deep dungeon is more fun than the others and there is a simple reason for it. The difficulty get progressively harder in the way that it absolutely should, rather than having some 1-shot enemies early on like EO. It allows you to queue for higher floors and incentivises everyone to do them via the challenge log, so that you don't need to dedicate 4+ hours to do a full run in Party Finder, which is not a normal amount of time to need in this casual game.

Another amazing thing about this deep dungeon is that if you wipe to the final boss - which you probably will when you first encounter it - you can practice it solo by clicking "invoke final verse". I practiced it for ages, wiped instantly at first, then got good enough to solo the entire thing several times. I got through to the final boss with a group again and this time was able to do the mechanics without holding the party back, and would have even been able to solo it if they all died.

That's so much better than EO, where there is a boss that you can't practice without actually getting up to it, so it's daunting to get up to it just to immediately wipe so you can't keep practicing it.

There are some better concepts here at least that they can look to apply to other content in the game so we don't have to waste eachother's time practicing.