Bring back crowd control. Bring back branching dungeons. Bring back ADVENTURE.

[Valic]

Unless we're talking about bosses, which we're not as we're talking about dungeon layouts, they will never get too difficult that they wouldn't be trivialized even within the same expansion. (And even dungeon bosses are not immune, see the final boss of The Burn even during Stormblood.)

And I doubt they would make dungeons that much more difficult considering dungeons are required content in this game and dungeon roulettes are a central part of the day-to-day gameplay. They even provide easier modes for solo instances now, so think about that philosophy first when considering new ideas for dungeons.

Keep in mind this is a progressively skyward mmo... If it doesn't get harder, ur just doing everything you're already doing from previous expansions. Personally I've felt mechanics and parts of this game get progressively more difficult... It should be that way. I agree the idea to make solo instances have optional easier modes is pretty bad as those were good tests of you having to know your damn job. Those aside, if you read more than just the bold in my post... you can do more to a dungeon than just change the bosses to affect the layout of it. In my example, I offered the idea of hints that provide the party with information regarding 2 bosses in the instance that have mechanics that cater to specific roles and the players can decide which boss they fight next say... as the 2nd boss. One of two choices based on the party's composition/decision.

All this said, it is indeed possible to make bosses and dungeons not trivial through gear/level/stats. They just need to be more creative in how they do it. Like another earlier example, a map marking what tiles/roadway in the dungeon causes instant death when stood on, or where players need to stand in order to deactivate a trap and open the door. Otherwise you're wasting time or having your healer ress everyone constantly, leading into a pull with no MP or everyone with death debuffs. Well geared or not, having debuffs that make your dps go down, makes a slower run overall, and the decisions made can impact the overall effort. These are the kinda choices dungeons need more of to actually be adventurous and enjoyable imo.