Overall this is a pretty great announcement.
I feel like the DCI really engaged with the topic, put thought into its choices and clearly explained them.
Although I had advocated sphere over thorn, their logic that the problematic play pattern is lock piece plus quick threat and thorn is more enabling of this pattern is defendable.
From a personal perspective, I was very much hoping for misstep. As someone who spends a lot of time in casual brewer / deckbuilder mode, misstep kills more ideas and drafts than any other card. I thought that opening up discard and one drop acceleration like birds / drs and fastbond / exploration would have been two new deck building angles that would have been fun to explore.