Sona's balance problem
tldr buff ult nerf auras
Sona has received minor changes in an attempt to balance her, but the big reshaping of her kit was in patch 6.14, which made her ult give her basic abilities cooldown reduction.
Things have been quiet for Sona over the past few seasons, so the sheer volume of changes here may look intimidating. In actuality, they all lead to one simple outcome: “Sona plays more music.” Let’s begin.
Sona shares a problem with many supports: it feels like she’s not doing much, even when she’s doing a lot. To tackle that problem, we’re playing into her unique game of musical buffs. Here's how it works: as fights unfold, Sona cycles between abilities, sending pulses of utility to nearby allies. Spellcasting activates Power Chord, offering Sona choices in how to neutralize her foes. These strengths grant Sona flexibility as the maven of extended engagements.
Here's where the feel-bad problem lies: Sona’s cadence is too slow to fulfill that fantasy. Dead air between beats creates downtime for both auras and Power Chords, relegating Sona to the background track. A remastered Crescendo passive solves that problem as Sona levels up, combining with cooldown reduction to cut her basic ability cooldowns by up to 67%. Understandably, we're adjusting the rest of Sona's kit to ensure she doesn’t go off the rails. Overall, Sona’s left with clearer purpose: transform fights into endless streams of song (and utility) as she scales into late-game.
I may just not appreciate the stuff about music because I play league with the sound off, but apart from that the problem the patch tried to address was that "it feels like she’s not doing much, even when she’s doing a lot". Unnoticed power is an issue because people want to feel like they're contributing to winning and want to be noticed for what they're doing, but supports, especially aura supports, often suffer from abilities that do a lot to make their team win but aren't very noticeable. I agree up to this point, this is a problem.
I don't think they dealt with the problem of sona not feeling like she does a lot despite actually doing a lot correctly though. Sona has insanely strong scaling with her auras because they get down to such low cooldowns, but because her basic abilities offer small, subtle, and supportive power they aren't recognized as the crazy strong teamfight carrying auras they actually are. But rather have power shifted to more noticeable abilities, sona got even more abilities giving subtle power.
As context about sona, I think her ult is her most iconic, flashy, noticeable, obviously powerful ability. When you think of big sona plays, you think crescendo. But as far as her actual power, I think a lot of it is in her auras. I'm pretty sure I could get to diamond 5 on sona without ever ulting (well, that was before nerfs, I'm not sure about now). Her auras are actually super strong because she can spam so many of them and outscale that way. How her basic abilities feel doesn't reflect that strength though. Her ult, on the other hand, feels and seems extremely strong and has very clear cases of "wow, sona just hit a great ult" where it's very easy to see the connection between what sona did and why sona won.
So if you accept that her ult is her obviously powerful ability and her basic abilities are more subtle sources of power, it seems wrong to address the problem of not feeling strong by increasing the quantity of basic abilities. Since her ult is the ability with clear skill expression, that should be how she is made to feel stronger.
The aura cdr on ult should be removed and compensated for with power that feels like power.
For one thing, sona's kit isn't really in line with other supports because she outscales them but to compensate has almost no hard cc early game. Her ult is on a 140 second cooldown at level 6, and that's it. As a result I often just mentally afk early/mid game on sona and do nothing because a) I'll outscale later and b) there's nothing I can do now. So sona's ult should be on a lower cooldown early (maybe just make it 100s at all ranks).
Her passive is another form of skill expression although I don't think it's as obvious, especially her w is extremely strong but often unnoticed. But even so it would be something else to make it feel like "sona just did something" when sona does something. So maybe when sona ults her next power chord could stun or do double its normal effect.
It would also be nice to make her ult a bit wider or start a bit farther back or something, because sometimes the current ult can miss people right next to you.
I'm not sure exactly what changes would be good or the specific numbers, but I think the main thing is they give power to her ult rather than auras spam, because her ult is what feels like it does a lot, not her auras.