The high level might look simple, but something like "attack" has to involve checking if it's possible/reasonable in a 3D space, animating turning and walking p

The high level might look simple, but something like "attack" has to involve checking if it's possible/reasonable in a 3D space, animating turning and walking prior to the attack, playing the animations, dealing with player block or parry, etc. Any good library author is going to try to bury the complexity so that users don't need to deal with it, but there can be a monstrous beast under the hood.