Madonna being a bigger touring act than whitney/Celine/Mariah doesn’t give her more star power than them either.
Touring power isn’t the beginning and end of star power..
Beyoncé is more recognizable, her image and music is more iconic/influential due to her strong pop culture presence over 20+ years. They are modeling pop stars in SK after Beyonce today in 2021.. building a skyscraper in the image of her body in Australia
Beyoncé-inspired skyscraper to be built in Melbourne | Beyoncé | The Guardian
outside of Asia and Oceania Beyoncé is bigger in South America, Africa and edges her out in continental Europe
Taylor is clearly the bigger commercial draw for obvious reasons, but I don’t think Beyoncé’s star power in general as a celebrity, brand and pop culture fixture has been supplanted yet by Taylor who doesn’t cross generations, different races (Latino/black etc) the way Beyonce does