We went from Angry horse noises to smug horse noises.

Couldn't you consider most of Discord's appearances as part of his arc? Since he goes from a lovable villain, to redemption, sudden backtrack because bad writing, and slowly learning about what friendship means.

And hell, if she wants to be smug, she just has to realize she's the first good villain we've had since Season 2's opening… She could lord that over the others for a while. (And she's not even an immortal demi-godlikebeing like the others.)

Now, I just can't wait for more of her!