Like it or not, I would chalk up a lot of Thor's nerfing in AEG to him being overweight, alcoholic, depressed and inactive for 5 years. I do understand how hard it was to seem him in that state.
Anyways no-one can convince me that AEG Thor, even wielding Stormbreaker and Mjolnir is more powerful than IW Thor. That's simply not accurate through a narrative standpoint. The Infinity War version of Thor(post creation of Stormbreaker) is by far the most powerful the character has ever been, to the point where they almost immediately had to nerf him because otherwise the screenwriters would likely write themselves into a corner since that version of Thor would render a lot of plot points and characters useless.