I guess that's one way to look at it. Another would be we just had a season and a half of Arya deciding whether or not she was going to throw away her identity for....reasons. Ultimately she realized that killing for the Faceless God and forgetting about her family were not things she was willing to do.
That sounds good until you remember we had to watch 20 scenes of her getting beat with a stick. Her last fight scene with the Waif ended with her getting beat with a stick, showing she hasn't progressed much.
That said, I did love the Arya scenes from this episode. I do love that she turned him down because she is unwilling to kill an innocent. I loved her showing sympathy for Cersei and laughing at Joffrey dying in the play. That was all perfect. But that doesn't make up for watching her get beat up with a stick for 2 years. All of the stick fighting parts feel like such a waste of time. Her leaving and her reasons for leaving are fine but the training parts should have been done differently.