What rule declares that Hulk or Thor has to be most powerful forever? That is meat this convo had it been Thor or Hulk it would have been badass, Someone infringes on certain fans power tier fantasy they moan. I can bet it was Sentry or Nova they wouldn't have even bat eye about anything. Once it is someone who doesn't fit ideal of who should be on top of power tier they get butt hurt which is Captain Marvel and Shuri annoy them.
They wanted Carol to be Superman of the MCU. From the beginning interviews about her that point of emphasis that she would be most powerful hero in the MCU. That is clear what they wanted from the character and that is how they use her and our nerdom doesn't let us overwrite creative decision. Who is the smartest, strongest, fastest, best leader and best fighter they can decide anytime to change it. The reason many solo heroes don't work at DC because they have impassable tier list and they have heroes scream stuff like " I am the 3rd smartest man in the world" but that is a topic for another day.
As people mention Carol Binary form has always given her a legit reason to be in top tier of heroes If creators chose to go in that route . She has a "Hulk gets anger" aspect about her powers that easily make her as powerful as situation she is in or needs her to be. Anyways tier list are meant to broken. How much has this list change over the years