User blog comment:Care Level/Itemization Holes/@comment-4636093-20130825061718/@comment-9593635-20130825145314

With Diamond Sightstone, the idea was that the reveal shouldn't last long enough for a support to take down wards on their own. This does make it an expensive investment, not in gold but in time: in order to clear wards, you need 2 team members dedicated to that purpose at any given time. Further, you'd also need some idea of where their wards were, which is simple(ish) for objectives like Dragon/Baron, but, for e.g. small skirmishes, it gets more complicated.

What would Riven and Zed with an item better than BT#2 be? Well, better. What did every AP mid going against an AD mid become when Seeker's Armguard was released? Well, better. How about Quinn and Irelia with new Phage? Better. Essentially, every time an item is modified in anything but a straight-up nerf, it becomes better for someone, and, accordingly, makes that someone better. Is that really a bad thing, though?

An AD mana regen item would be a good addition. Good call.