Honestly, the arguments about Hanyi's combat ability are kinda irrelevant.When or if she does grow to that level we'll have this conversation again. Right now? There are so many better options both immediate and potential.
Ultimately, we'll help her because we want to help our cute junior and Ice Mom.
Now, in the more immediate future I still argue that there could be great merit in getting a nice stealth DPS spirit to round out our team and utility. As well as maybe giving us +darkness which we tragically lack. That being said, the qi concerns are real there.