Why in god's green Earth do dungeons have a timer?

[Tupsi]

-snip-

P.S Most MMOs out there (especially Chinese and Korean ones) has timers on their dungeons or other instanced content because chances are they're a timed event based on achievement requirements and too suffer from "nothing but an elaborate hallway" design. What would removing the timer do..at all? You do realize there's literally nothing to the dungeons in FFXIV once the monsters are all gone...right?

It's not like FFXI where there could be actual puzzles or NM spawns or ability to Spawn NMs/Bosses throughout..right? Like how if you're going through Den of Ranchor (Dungeon) located under the Temple of Uggalepih (Tonberry dungeon) to reach Leviathan's Protocrystal (arena to fight avatars)..that would be a pain if you were timed...in XIV? It doesn't matter so much because you:

1. Clear Objective A-D
2. Slaughter Enemies
3. Kill boss
5. Get 5 minutes to collect loot.
6. Dungeon has zero purpose after 1-5.