Okay so episode 2...I hate to be "that guy" but uhmmm...why is T'Challa Starlord? StarLord was the name Quill's dying mom gave to him for being so brave during her cancer treatments and because of his love of music. He specifically named himself that to honor his dead mother, from 1980s fucking Missouri.
Why does T'Challa use the same name? He has no connection to it! It'd be like if T'Challa got the super soldier serum but was still called Captain America. There's a little bit of context that's required. That's kinda the flaw with the What If....premise. Just taking characters and replacing them with other characters, and seeing what happens.
Stories don't work that way. There's no reason he should still be Star Lord, no reason the Wakandans would let him be taken, no reason for Nebula to be in a blonde wig, or Drax to have a completely different personality.
It doesn't count as a clever take on a character or story if everyone has a completely different personality, backstory, motivation, drive, mannerisms and moral compass. At that point its just a different story with different characters. Robin Hood Men in Tights isn't a story about what if Jean Luc Picard wasn't born in space age France, but as the son of the King in feudal England and grew up to be Richard Lionheart. Its not What if...Picard was Richard the Lionheart.
Its just the same actor, that's all. These really aren't What If stories, they're just completely separate stories using the same actors.