Dungeons are pretty routine, and at first, SE did want to make them spicy. The playerbase did not react well. The complaints was that if they have to grind dungeons to get weekly cap tomes, then the dungeons should be "streamlined" so that they aren't a time intensive chore. People still auto quit sometimes when they get Aurum Vale for leveling roulette. Pharos Sirius was the first dungeon that they made that had some spice, and it was nerfed within a few months, due to a large amount of people auto quitting if they got it for their roulette or if they didn't think the tank or healer was geared enough to take it on. Or if the composition lacked a DPS that could Silence Siren. She was stunnable too, but built stun resistance. A lot of the earlier hard mode/level 50 dungeons from ARR had neat mechanics. It'd be nice to see a return to form, but if it's too involved, most people will complain.


That's something else to consider too. Dungeons can't get too spicy, because entry requirements have to be kept accessible to the majority of players. Surely, they could make them more involved, but higher geared DPS would mostly overwrite the need to do mechanics anyway. If you pay attention in current trash pulls, there's always something to stun or silence that make your tank/healer's lives just a bit easier. Stunning the manticore tail AOE in Holminster Switch lets melees continue to DPS. Silencing the Fuath froggie in the pulls of Dohn Mheg makes sure the trash isn't buffed with ATK up. Not really any problem monsters of note that come to mind for Qitana Ravel. I guess you can stun the golems in Malikah's Well when they do their AOE, again mostly to spare melee DPS and tank from having to dodge/stop AOEing.
If you're ranged, you can always leg/foot graze a monster or two to keep them off the tank's back for a sec, till the pull concludes. Course this just means they'll still be alive when everything else in the pull is dead.

In general, dungeons are tuned so that you can do them without healers if you keep pulls small. You could even do dungeons with x4 DPS, depending on what bosses do. One way you can spice up dungeons for yourself is to form pre-mades of non-traditional compositions. I found myself doing that some during a patch lull in Stormblood and also back in ARR. Course, in the past you could have a SMN act as tank with Titan Egi. Since that's been scrapped, it's kind of sad times for non-standard dungeon fun.

I guess my TL; DR point would be, remember you can make your own fun in the game. It's not all up to the devs; there's only so much they can do with the restrictions and past positions they work off in relation to the playerbase.