Dungeons in their current state have carved out their gameplay and reward structure niche.

Exploration and puzzles are fun, but IMO better suited to other forms of content such as solo quests, or large duties like Eureka where one or two people can be off exploring while other people focused on being efficient can do them etc. Or puzzles/exploration worked into quests etc.

Dungeons are meant to be spammed day after day. So those exploration elements are going to get old, and cause conflict with people who want their tomes etc. We have deep dungeon for randomly generated content.

I'm all for exploration, hidden bosses, etc, but I don't think dungeons in FFXIV are the place to put optional or explroation/puzzle based content. Just as deep dungeon isn't somewhere you want tight dps checks on bosses, and msq instances shouldn't have savage level mechanics etc.