Why does it seem like every game, i need to build Locket + Face of the Mountain as a tanky support?

Don't get me wrong - Locket is a fantastic item. I can get it mainly for the shield and doesnt feel bad of an item when there aren't many mages due to its low self-MR. But it seems that if I don't get shields on champions like Leona, Braum Tahm Kench, I can't support well. I mean 1 shield is nice but 2 seems a bit too much. Plus it makes builds a bit too tight ( )

Or what would you recommend as a build that offers defense without having to sacrifice 2 spots for health items.