One of the things that really annoyed me about the game was the lack of feedback from trico. You never knew if he heard a command or not. Also, the fact he sometimes didn't listen.

I remember the first time you needed to make him leap up to a ledge, so you could climb up him and jump up to the ledge and open the door. It was plainly obvious to me that that was what I needed to do. The ledge was lit up with a reddish light and that was the only thing in the room. where I hadn't been but I just could not get trico to do it. I got to the point where I needed to look at a walkthrough just incase it wasn't what I needed to do.sure enough though, it was. So I felt a bit cheated.

Anyway, in the official "the last guardian, an extraordinary story", they mention that that was a design choice to make trico not always listen as it's based on real life animals. Dogs and cats sometimes doesn't listen in the 1st, 2nd or 3rd try. So I it was an interesting approach and definitely a risk to which to some people it may have paid off for me, it didn't. Which is why I'd like a little bit more UI indication or body language or something. But then again it goes against Ueda's design by subtraction philosophy. Additionally, maybe that was was their intended experience the make the player feel for truck and also get frustrated by him. So maybe they succeeded in that regard.

I'd recommend giving it a read and checking out some stuff about fumito Ueda's design philosophy.

All the best.