There hasn't been a squadron dungeon yet where mechanics were considered for the "AI". So yeah, they can add more dungeons where they don't need squadron members to execute more complex mechanics. The failed mechanics up to this point don't have an effect on the player or squadrons just don't take enough damage from them to matter.
Many of heavensward and stormblood dungeons have those unique mechanics that are a bit more complex and cant really be ignored all the time, therefor I don't see them adding new dungeons of that lvl range in the near future (could be botting reason too). They can probably add more ARR dungeons, they can sell it as new content, but players probably pick the fastest exp dungeon anyway so it wouldn't really matter that much and would feel like wasted dev time then.