Hi. I am ECS noob, so might be a stupid question. What is the benefit of using System over Behaviour? From the tutorial it seems that I could create a Behaviour instead of system and have a bit clearer code and architecture - at least from my point of view. Can I simply use Behaviours everywhere? SpawnSystem vs SpawnBehaviour might not be the best example since the forEach query is quite simple. Used just to illustrate what I mean. Thank you!