Audra, Kristin and Phantom

I know that they aren't ingénue's anymore but I'm just curious as to why Audra and Kristin had never stepped into Phantom as Christine. I know Kristin did some variation of Phantom though it was ALW's but I just can't believe we have never heard Audra sing anything or hop into it in the past. Is it not in her range or what? She's probably just had other business ventures but I just feel like with her being a trained opera singer this would be one of the roles that she would be aiming for as trained belters rn would aim to be Elphie.

The show doesn’t need them, and they don’t need that show.