The [Spectator][1] has the Create Food and Water action (*Monster Manual*, p. 31):

> ***Create Food and Water.*** The spectator magically creates enough food and water to sustain itself for 24 hours.

I don't understand why the Spectator must use an action in order to create its own food and water to sustain itself.

Wouldn't be easier to add something like the [banshee][2]'s Undead Nature trait?

> ***Undead Nature.*** A banshee doesn't require air, food, drink, or sleep. 

They could have given it a trait like this instead:

> ***Abberant Nature.*** A spectator doesn't require food or drink.

Is there any important mechanical difference between both abilities? I mean, any exploit, advantage, or drawback that has *create food and water* over *it doesn't need food nor water*.


  [1]: https://www.dndbeyond.com/monsters/spectator
  [2]: https://www.dndbeyond.com/sources/mm/monsters-b#Banshee