Sona is obnoxious and toxic to lane against.

I'm sorry, it's true. She can just sit at 850 range and throw poke at you all day long, and there's nothing you can do to dodge it. A good sona will stay behind minions and poke the living daylights out of you from a position of complete safety. If you do manage to poke her, she'll just sustain it back up by mixing her heal and her potion. Every time I play support or adc into sona, I just want to quit, because I know my laning experience will be horrible unless the sona isn't competant, which is unlikely since she's braindead easy to play. Her only real counter is hard-engage supports, but with windspeakers buffing both her heal and her shield and giving her armor the whole time, even they don't feel strong enough to burst her down, especially post 6 when she can just ult and turn the fight around.

I know Sona has gotten changed a lot over the years,in pretty bad ways, but she's still toxic and boring to play against. Every other poke support relies on skill shots to be effective; Sona has a lock on, long range, champion-prioritizing, low cooldown, low mana cost poke. It's just boring and toxic to play against.