I think Phillipa Soo is outstanding in Hamilton and didn't intend to overlook or disrespect her ... but in terms of stage time and the overall role, I consider both her and Goldsberry to be featured actresses. I'm probably wrong but it's just how I feel.
She is wonderful and her songs and scenes are excellent. Personally, I just don't think you can compare the quantity of her role (note, not quality of performance) to the other potential lead actress roles.
I like a good rhyme more than a good time