Why does Recuve Bow still exist?

Chain vest is changing to build out of Cloth Armor. Negatron Cloak is being removed. Both of these are to reduce redundancy, and make any component item worth something. So why keep Recurve Bow? It currently builds into three items (Runaan's Hurricane, Wit's End, and Sword of the Divine), and all three of those items also build out of Dagger. Cloak of Agility also has this problem, as a more expensive version of a common component item, but it only builds into two items (though, admittedly, one of those items doesn't also use Brawler's Glove).

What reason is there for keeping both these items? The AD/AP items make sense existing in 3 tiers, but these two don't.