I feel like Kalista is really underpowered...

I love Kalista for her high mechanical playstyle and her kit, but recently I feel like she just isn't as good as she once was... While other ADC's do 100% of their entire AD as basic attack damage, she only does 90%, which I find, makes a difference. Also her scaling attack speed on w is pretty strange, you need to be close to your oathsworn or you lose that attack speed bonus and you're weak. For example, you lost lane and you're behind, you want to farm botlane while your support roams around the map to help other lanes. You're really weak in a 1v1 against the other adc. Vayne can become invisible and outplay you, Caitlyn can play with her traps so you have to go around them and be careful with your dashes, Draven, well, it's Draven, he'll just one shot you, Lucian can easily outdamage you, etc. I feel like to play her, you need to have really good mechanics. But that is just my opinion. And finally it's just something I'm not sure of, when you get slowed, is it just me or you also attack slower? I just hope she'll get some tweaks or changes in the future since I find her kit really interesting.