Xayah feels more like an AD caster mid than an ADC
with how her feathers are and damage shes designed to do with them she feels much more enjoyable as a midlaner than an ad to me, she's also pretty vulnerable to character that are very common botlane
most notably. she doesn't really have that issue mid imo where she can easily get to farm because of clean cuts than those two either outranging and poking or getting in her face and just killing her a lot faster than she can kill them.
iunno, maybe I'm just bad at her or adc
mid would be the most popular role four him