Said it before and i'll keep saying it
Sona needs be impactful early.
She can have a bad early game, but it's insane that you can have a champion (any champion) be at level 9-10 and still feel slow and cumbersome like a level 1-3 champion. A support shouldn't need 45%+ CDR to effect the game; a support shouldn't need a bunch of AP for their spells to matter; A support (hell ANYONE) shouldn't have a kit that only starts getting "good" around level 11; But most of all a support shouldn't need ALL of those things to be more then a walking ward and ultimate.
worlds meta as an example. Sona was the champion that could break that item the most, what with her ability to trigger it on the whole team constantly. Yet she didn't really see play, instead we saw a lot of
or
. both champion that could abuse the power of the item but no where near to the level that Sona could.