Brand helps financially, no doubt, but brand helping artistically? that is not that far less complex with marvel studios unlike other studios like WB or Sony because you dont know what you will get with those studios, As much as there are MCU or comic fans, casual film fans, kids, who will see Eternals because it is part of the MCU brand. You now have another group of film fans and comic fans and the Scorsese fan types ,who will have automatically written it off as a not ''serious director driven film'' all because it is part of the marvel brand.
The coin has more than one side. It's like Vegeta was saying, she knows the MCU Brand and does not expect this film to surprise her or be a breathe of fresh air as James Gunn SS 2. Can we say Vegeta points are not valid? I don't feel so. the hard lesson here is that A lot of the times, branding has many equal pros and cons.