I was shocked as well.
The nerf they were originally going to put out was a great solution, but then they tweaked it further and now it sucks. They're trying to compensate those severe nerfs by giving her a slight buff to her heal which won't make a difference in this meta.
She does not need a buff to her W. The old sit back and heal Soraka has not been viable in a meta with this much damage for a while. She needs to be interactive early game, so nerfing her Q further, especially in an engage support meta, was the wrong move.
It's hard enough surviving against champions like Nautilus where you're one broken hitbox away from death or other champions like Zyra that spam pokes you to death so easily.
Her Q is so easy to dodge because the missile time takes forever. If anything, that should have been changed as well. For anyone that is wondering, the new Q nerf also lowers her self-heal and movement speed granted as well as **increases **the mana cost. Again, it's one of the easiest abilities to dodge bot lane.