It is in no way hyperbole to plainly state that Sona is decidedly the weakest support in the game. She has a shit laning phase, followed by a weak mid game & only becomes mediocre in the late game, just to fall off yet again in the super late game. It shouldn't come as a surprise to any competent person why she has the lowest pickrate of any support & the overall 6th-lowest in the entire game.
This isn't even the first time Sona was directly compared as the inferior version of another support side-by-side. In fact, it's at least the 3rd time this has been said. Meanwhile, Senna has nearly a 70% pick/ban rate. I genuinely can't fathom how ANYBODY could unironically claim that Sona, the weakest support in the game, has any benefits over Senna.
Sona isn't even allowed to exist, as inherently evidenced by Rito's continued refusal to revert the patch 4.13 "rework" that landmarked her indefinite disappearance from this game.