I mentioned this before but the problem is Coogler didn't even do right by T'Challa in the first movie.
He made him of average intelligence. When he's supposed to be one of the smartest in the Marvel Universe. Instead Shuri was made to be the smartest.
He's supposed to be one the best fighters in the Marvel Universe. He instead got beat by some random angry dude from Oakland.
Which would be the equivalent of batman losing a fight to some random street goon. It would never happen.
And so you had the Russo brothers who actually did right by him by making him a better fighter and leader than Coogler did.
So I think the problem is for him it was just a job that he didn't care much about and he pushed his own narrative with the script of Black men as barely competent and taking a backseat to Black women because that's what he does in his own personal life. He literally can't imagine black men in control of anything.
And I mentioned this before but BET of all networks portrayed T'Challa in the best possible way in a cartoon.
Because in the cartoon, Wakanda gets invaded by Klaw, the USA
, a rival African country, Juggernaut (!!), Black knight, and Radioactive man. And Shuri takes care of Radioactive man but T'Challa while he's fighting Black knight works out how to take care of all the rest of the threats and saves Wakanda.
I doubt Coogler knows of that and if he does he ignored it. And certainly ignored Captain America Civil War because he just wasn't going to show T'Challa accurately.
And about the agenda, that comes from Coogler and his people. If he wanted Wakanda to be represented by Black men he would but he's one of those weak male feminists who hates being a man or being in charge so he pushes that idea on a fictional world.