Sona is boring garbage now.
I used to have fun once, rushing Hextech Revolver to have a reliable way of applying Thunderlord's with just a Q and a Basic Attack, jokingly referring to the build as assassin Sona.
Now not only does that not work, exposing me to a world of pain as I am forced to stay in range of retaliation for the excruciatingly long amount of time it takes to actually land the second hit, but when I try to do it anyways, I deal significantly less damage due to the absence of a wide range of smaller bonuses and early flat penetration. Sona does not have the amazing AP ratios for all this "adaptive" garbage to have any impact before she gets a Lichbane, which she cannot afford if she can't get an early takedown or two, and by the time she does, there's no longer any viable targets. Getting to a damage level that I could previously achieve while still having a reasonable amount of defensive stats now also requires giving up 100% of any potential durability boosts, making the risks of any aggression outweigh the payoff. On the opposite hand, the playstyle that came out stronger than ever for her is the "passive heal bot", which I absolutely despise to play as or play against, meaning she probably won't qualify for any buffs in the near future.
It's really a shame that I'll likely have to stop playing my favorite champion(first on I got to Mastery 7, own all skins, etc.), simply because I no longer am able to compete with her in a way that's actually fun to play.