It's a shame that LotA is a Raid because it really has the right format for a good dungeon:
Trash mobs + Elite mobs > Major boss > mini boss > major boss > mini boss > major boss > big boss.
I get that the current dungeon design emulates the classic FF forumla. You enter a cave, fight waves of random encounters and defeat the boss at the end.
Problem is, FFXIV's battle system isn't tailored around short bursts of combat. There are too many trash mobs that kill the experience. They don't last longer than one skill rotation and it eventually becomes a game of monotonous button mashing.
FFXIV's battle system really shines during boss encounters. That's what makes Labyrinth of the Ancients the ideal dungeon design.
It's one linear instance involving waves of bosses. The boss mechanics are light enough for anyone to quickly understand, but has enough depth for the fight to remain interesting.
Could you imagine a 4-8 man instance like Labyrinth of the Ancients?
I'm hoping the game designers evolved from what they did with LotA and make the new 2.2 dungeons focus on boss battles.