I don't fully agree based on what Coogler said about BP. Like I think he wanted a fleshed out World but he wasn't trying to make Black GoT or Black star wars, of he was then the supporting cast (namely Nakia, Okoye, Shuri and M'Baku) would of done more and had more moments that really turned the tide or made more impact. Everything we experienced through the Solo, every interaction people think someone"stole the show" has a common theme.
T'Challa, we experienced Wakanda with him, these characters shined the most when interacting with him. I don't care what anybody says, like MoS put a few days ago, T'Challas conversation with Zuri and both conversations with his dad and the ones with Erik, particularly the last conversations on both fronts were more powerful than any other . moments in the movie. I heard people audibly saying "amen" and "holy ****" during T'Challas all of you were wrong speech. My wife who is not a super hero or comic fan at all was blown away by how powerful that scene was.
I think that had Chad survived, we would get more focus on T'Challa, Chadwick wanted that as well and I think we would of gotten it. However tragedy, grief and greed are running the show