Soraka doesn't see a lot of play...
I thought she was reworked so she could safely see more play in the game and be an LCS pick. However right now she has a pick rate that's below 4% almost never banned because no one cares about her. So people aren't picking her and they aren't banning her either. I mean you could justify banning someone like Janna, Morgana, or maybe Annie (all of whom can physically prevent you from getting to the ADC) but Soraka? No way. I can't remember seeing her in the LCS since she was nerfed. I think her rework was a total failure.
-She can't trade/poke as well as sona or karma. -She's got no hard CC or useful peel which even Sona and Nami have (Soraka's E almost never snares rendering it useless as peel) -She's got no kill potential like leona -She's got no grabs like blitz/thresh -Her heals make her run back to base (not fun gameplay at all) -She's got no mana gift anymore -Her Qs are easily dodged and drain too much mana. -It really sucks to die while seeing the heals from your Q come back to you -She can't build Nashor's or LB for bigger bananas -Despite being a healer her self sustain in lane is weak to none, esp if the enemies are smart enough to dodge, on top of killing herself with her heals. -Everyone who plays MtG knows healing by itself isn't very good in general. -She's an oldschool mage in that she has zero mobility... just about everyone else with a heal that works on teammates has some form of mobility. Taric has a stun to compensate and Ali has CC and knockback. -But she's not a mage anymore so she doesn't even have firepower either
Perhaps it is she isn't that fun enough or useful enough to play anymore?
TL/DR please add more fun back into her kit