Gentlegamer
Adventurer
I generally agree; however, the strongest (and reasonable) counter argument is that if monsters aren't at least somewhat "naturally biological" then the players cannot apply real world reason to interacting with them which can be problematic.Monsters, IMO, should be fantastic. They shouldn't be consistent, since consistency breeds predictability.
This tension is related to the literary criticism of the Balrog and Shelob vs. Orcs and Ents in Lord of the Rings; the former are pure monsters with no "ecology" to relate to, where the latter at least seem to conform to biological norms the players can relate to and base decisions on.
Sam, "Surely Orcs have to eat? They don't live on foul air and poison, do they Mr. Frodo?"
Frodo, "Yes, Orcs must eat just as we do, but such meats are not for us, Sam. We'll have to find other food in order to carry on."