If your goal is to keep your teammates alive you have exactly 3 items to help you do that, 
. Of those three the only one that kind of scales your champion's current heals or shields is and that only works against magic damage. Added to that, most of the champs who can heal or shield their teammates are ranged and squishy so they can't use .
That is downright pathetic.
This almost sounds like something that belongs in a mastery - the self healing mastery when under 20% seems pretty lackluster. Adding to it that shields and ally heals on allies below 20% health may make the mastery more useful for champions other than aatrox and possibly mundo.
all of those scale
They've been moving away from generic defensive items that can buff your whole team. The exact reason Runic Bulwark was removed from the game was because it was an item built in 100% of games. Regen, MR, Armor, it gave everything your team needed all at once. Every game would start with deciding your team's designated Bulwark carrier and then it became a race to see you could finish the item first to have the upper-hand in the first teamfight.
, 
No one picks it up, but it exists.
Just pointing out that is a general damage shield not a 
shield
Little know fact: all healing done to you is classified as self healing even when it comes from an external source.
So the healer can't scale themself, but the team can scale their healer.
If you want stronger shields/heals...play one of the many supports that actually offer shields/heals?
