Her progression is a bit normal for a vocalist.
Most opera singers don't peak and reach vocal prime until 35-45.
And B never sings to her limits. Even when she does, it's usually like once or twice throughout an extended period of time. Even with the tours, her voice is still healthy and pristine.
I think her voice will gradually get darker over time, and more brassy.
Just don't like the raspiness that she applies to some notes.
Her voice, for me, was best during the I Am tour, but this one is slaying too.
She's freeing her voice even more than she was during the I Am tour. I'm interested to see where she takes it.
She hit 15 Eb5's in a row. That's almost unheard of today.