Suggesting something that might improve Sona a bit at least

... that her W either only heals or only shields. Seriously, because she has both at once on her W, it does not allow her to be either strong at early or late game. Sure, Sonas old kit did heal and buff resistances, but now since riot wants her to have more active power, they gotta decide what they'll keep, either stronger sustain in lane through healing, or protecting harrass and engages with a powerful shield.

I'm a Sona main, and I literally don't like the idea either of removing her heal from her, because that's how I grew up with, but I'd rather have her having no heal for an stronger and eventually more mana efficient shield.