I sometimes use lists as compound keys, so I need a version of case that lets me compare against literal lists (whether it gets called "case" as it is in Arc now or something else).
However I don't use Anarki, so it doesn't matter to me whether you push it there.
It may not matter to you, but IMO it matters to the community (what little of it there is) that anarki and arc not break compatibility in such a simple case as this.