What's the point of having Spellbinder and Spear of Shojin?

SoS has less than 5 Champions that use it? (Renekton, Jax, recently Nocturne, Riven every now and then and Master Yi potentially). And then Spellbinder which is completely none existent in most games (appears on Evelynn sometimes and Syndra on rare occasions). Why do they need to exist? They aren't really useful for majority of the Champions in the Game and basically exist as an extra option to snowball. I'd rather have them replaced for something else.
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