Basically the title.
While I appreciate the restore feature (it's great in case we delete something by mistake), I miss having the ability to permanently delete decks we've deleted on purpose, like in version 1.0.
I like to publish a new version of the same deck, because the Update Log tends to take up a lot of space if you make frequent updates to it, making the deck's profile page look cluttered after awhile, at least from a reader's perspective.
I also imagine that there's a maximum number of decks that can be stored on the website (whether in the "published" or "deleted" sections), so having the option again would help minimize bandwidth and data usage.