Obviously because of her talent
I think you're being shady and meant this to be diss.
But yes.. Arin shines because she is a very talented idol.
Arin is actually one of the very best idols in the traditional mold.
Raw vocal talent is not necessarily her strength. But she is a standout in most everything else that makes an idol what they are.
A top draw in their performances as a lead dancer. At the center of their appeal in fan service and vibe setting, much like the appeal of Sana in TWICE. She hosts. She acts. She has solo releases. A top visual. A charming and infectious personality and serves as a main stan attractor.
She's the kind of idol companies dream of getting in their group. That embody the group energy and serve as critical mass the groups appeal revolves around, and can latch onto.
You build groups on idols like Arin.
So yes.. Arin is one of the very best and talented idols.