I'm glad I was alive to see this.
Aside from the obvious, I think I like every narrative turn in this story. I like how Arya didn't do anything stupid in the last minute, and that they had a proper reunion. I like how it only took this episode for Sansa to get a sense of what Arya has done (at least my sense was that she believes it now). I like how Arya doesn't try to hide it.
Also their second hug was great. For me it signaled Arya realizing "wait, Sansa isn't an idiot anymore!"
And I really like how this ballistic thing didn't kill the dragon. If it had, I think I would have criticized it as a plot convenience. Like, yeah this thing could in theory kill a dragon, but it's like shooting a normal sized arrow at a pig that also wears armor. If you are a really good hunter, and you have a lot of time to carefully aim, I'm sure you can kill it with one shot, but none of those things was the case here, and it seems far more likely to end up like in this episode.
The one thing that I kept wondering though (and not for the first time), is-- did real knights really use to practice with real swords? As great as that Arya vs Brienne scene was, it did seem unnecessarily dangerous.