Regarding Disney's recent HT mixes, I can only second what others are saying about them : they are disappointing, and no, it's not just a question of loudness or master volume.
What's interesting is to compare how it pored through video releases : the Forbes article has the starting point wrong : AOU was already problematic on BD. It was under-cranked, but also flatter than expected and with empty bass (I suppose the track doesn't go particularly low in frequencies).
Its unfortunate the article is imprecise regarding this (though I guess that can only be expected from a non-technical publication like Forbes), but having now listened to many of the recent Buena Vista BDs, they do feel disappointing outside from the master volume being too low. They certainly aren't all the same, and some sounded better than others, but AOU, Black Panther, Last Jedi, Thor Ragnarok, GoG 2, but also things like Coco.
Infinity War sounds a bit better and mostly is slighlty under-cranked, but even once the MV is increased, it still feels less impactful that one would expect.
I can't say if it's a creative issue more than a technical limitation. But what I do know is that something definitely changed in the way these tracks are mixed, and despite whatever people might say (especially regarding how other studios have clipped or filtered tracks, as if it explains why the BV tracks are picked up but not the other ones, or as if it would somehow makes it better to know that), it's telling to see in the first post of this very thread the scores obtained by earlier MCU discs (Winter Soldier, Incredible Hulk, Thor 2) and then look at the scores for more recent movies.
I don't know what Disney changed, but clearly, if they didn't change anything, we wouldn't have this discussion. If they changed it in a way that didn't feel this obviously debatable, we wouldn't have it either.
So if Disney wants to simply go back to whatever they were doing 6 years ago, I'm all for it, and I DO hope they listen to the complaints to just go back and do that.