Could I have context behind Illaoi's changes please?

I checked S@20 and apparently she has a 15% missing hp heal instead of her 5%. But, the heal is on a CD and can only activate every x/x/x/x/x seconds. Could I ask for the reasoning behind that? Wouldn't that make her weaker because the heal stacks ( i think) so hitting 2 people and a vessel equals a 15% missing hp anyways, which you can do many times over again if you ult and W correctly. I can see this change possibly being decent for her laning phase where it gives her more lane sustain, but isn't that a undeserved nerf for her dives (both her and others). Context/Reasoning behind these changes (and if the current Q heal stacks) would be great, thanks :D
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