I really liked Aaron's first God Butcher story and he had some interesting ideas after that like War of the Realms and the future Galactus and Ego the Living Planet. I could even go along with the Mjolnir retcon and Jane Thor did have her moments. But overall his execution got worse and worse. Ultimately, his tenure didn't work for me.
Aaron and Cates suffer from similar problems. Neither really care about established power levels or continuity all that much. I'm okay with authors breaking those if what replaces them works, but what they wrote didn't work for me, again not so much the plot ideas, but the execution. The Black Winter coming for Galactus with Thor intervening could be a great idea if executed properly. But under Aaron and Cates, characters just don't act like the characters we know, and the way they did act didn't make them more interesting. Fictional worlds need rules. If anything goes, then that's bad writing because anything you write is not measured against anything else. With no rules, you can literally write anything and get away with it. I don't feel like Aaron or Cates have any rules.
I think they and most creators at Marvel/D.C. have a mandate to use both their story and company wide view. My guess is that starts at the top down to editing. Whether that is a good thing depends on what point of view we subjectively see as a finished product.
I would not close the book on the Black Winter/Galactus plot line. There are still unanswered questions to be resolved. Galactus behavior like attacking Thor after empowering him. The true nature of the BW and if it or Galactus are truly dead. We know Galen will return and fairly soon. There is treachery/conniving yet to be seen. Kind of sounds like Aaron with the Gorr story. That is a bit unsettling but I hope Cates does not go too far in that direction.
I feel Cates did well in the setting up what we have seen so far though all is not played out. Power wise it is good to see Thor being the one kicking butt for a change. Aaron continues to use him as a chump in Valkyrie and Avengers on a monthly basis.