Can we admit that Sona is just an extremely poorly designed champion?
She's jack of all trades, master of none.
The issue is that when you stop mana gating Sona she becomes broken. She's easily the most broken champion in ARAM because there is no counter to infinite heals without cost.
She has the skills necessary to suit multiple playstyles. She all ins just as well as she plays the heal and poke game. Her heal and poke game is arguably the best right now and she's just annoying as hell to deal with no matter the game mode whether it's ARAM or SR.
But she's got a solid engage/teamfighting skills as well carrying with her an AoE ult.
The problem with sona is that she's the master of none, but that doesn't mean she isn't 80% as good as a teamfight support and it doesn't mean she isn't 80% as good as a sustain/heal support.
Riot, you need to punch Sona in the face right now. Cripple her healing and put it all in a shield. There... Now you've got Sona as a champion who really is about poking and trading.

