Why Won't Sandra Oh Return To Grey's Anatomy?

Sandra Oh made a name for herself while starring on Grey's Anatomy on ABC as Dr. Cristina Yang and as Meredith Grey's "Person" but according to People, she has no plans to return to her roots. Part of it goes to her success from Killing Eve on BBC, afterall she won a Golden Globe for her role!

“I just got to tell you, creatively you have moved on and while I know, and I deeply appreciate it, because I can feel it from the fans how much they love Cristina and that the show also still keeps Cristina alive, for me, [Killing Eve] is my home now."

I totally understand why but gosh to see Cristina return would be everything!