Quote Originally Posted by CerusSerenade View Post
A dungeon can be cleared without a tank. Tanks are useless and content needs to be made to make them more necessary.

A dungeon can be cleared without DSP. DPS are useless and content needs to be made to make them more necessary.

A dungeon can be cleared without a healer. Healers are useless and content needs to be made to make them more necessary.

https://www.youtube.com/watch?v=f4O4JGCC0g4
1T 3D might clear a dungeon in 15 minutes.
1T 2D 1H might clear a dungeon in 20 minutes.
3D 1H might clear a dungeon in 30 minutes.

It's not that it isn't impossible to clear it with out a certain role, it is that it is more efficient to clear it with 1T 3D.