I was just sifting through my 1000+ maps when I said to myself, "Self, wouldn't it be nice to play some maps you haven't played for months?", except I had forgotten which ones I'd played recently since I have so many. If one of the sort-by options would organize the list according to the last time you played it, that would be pretty handy! Depending on what data is actually available, this could either be by: most recent attempt, most recent completion, or most recent ranked score.