The callback solutions via the Unity's animation system is kinda tricky and as you said expansive to maintain. I found out to discard that solution for my concerns.

The global monitor solution requires a bit of effort but should give some handlable ed effective solution to the problem. But it wraps up the concept of Coroutine. A Coroutine can handle your WaitForAnimation step on its own.

I use Coroutines. When the anymation starts, you can Sstart a Coroutine which calls a function that do things. You can code roughly every kind of situation.

I apologize since I'm not on my dev post now so I'll write some pseudocode to give an idea. I could update later if you think this is of eny help.

private IEnumerator HandleAction(GameObject entity){
    Animator anim = entity.GetComponent<Animator>();
    float duration = anim.GetCurrentState().GetClip().duration;//not sure of this syntax. will update later
    while(duration > 0){
        //do stuff or wait
        duration -= Time.deltaTime;
    }
    //code to execute when animation ends
}

The callback solutions via the Unity's animation system is kinda tricky and as you said expansive to maintain. I found out to discard that solution for my concerns.

The global monitor solution requires a bit of effort but should give some handlable ed effective solution to the problem. But it wraps up the concept of Coroutine. A Coroutine can handle your WaitForAnimation step on its own.

I use Coroutines. When the anymation starts, you can Sstart a Coroutine which calls a function that do things. You can code roughly every kind of situation.

I apologize since I'm not on my dev post now so I'll write some pseudocode to give an idea. I could update later if you think this is of eny help.

private IEnumerator HandleAction(GameObject entity){
    Animator anim = entity.GetComponent<Animator>();
    float duration = anim.GetCurrentState().GetClip().duration;//not sure of this syntax. will update later
    while(duration > 0){
        //do stuff or wait
        duration -= Time.deltaTime;
        yield return null;
    }
    //code to execute when animation ends
}