Not sure I understand the arguments that Hulk's arc was leading to him getting a rematch with Thanos. Ragnorak showed the issues with the Hulk personality being dominant, Infinity War showed the issues (though only very briefly) with Bruce Banner being dominant, this movie was about finding a balance, and the character finally being happy. That's growth, and it's a satisfying arc that doesn't revolve around him punching people (which is good, since a lot of other characters were already laser-focused on punching Thanos). He comes to a peaceful resolution by realizing he's more helpful as a complete person than as an extra pair of fists.
Professor Hulk was the only possible way for us to have a character with both the strength to wield the infinity stones and the mental fortitude to perform the snap. And he brought everybody back. That was his arc. I really liked it, personally. This was Mark Ruffalo's best performance in the MCU yet.
If anything, I think the Bruce part of Professor Hulk got short changed. You have access to Hank Pym's technology and research, Bruce Banner, and Wakanda scientists, but Tony Stark solves time travel on his own in his free time at home? This should have been a bigger collaboration... but then maybe Tony's arc doesn't work as cleanly. At least Bruce got to do some work on time travel, so maybe we can trust that, with enough time, he could have cracked it as well.
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Anyway, this was a good interview and I'm pretty satisfied with all of their answers. The multiverse stuff could definitely get messy, but I think it's all good enough for what this movie needed to accomplish.
I wish we got to see more of Drax's reaction to Thanos, and Quill's reaction to earth, but if we're lucky Guardians 3 will touch on that before moving on to the Gamora / Adam Warlock plotlines.
P.S. the suggestions that a) Black Widow and Hawkeye should have been romantic because their friendship wasn't enough and b) the Black Widow prequel is now "meaningless" are both bad and, funny enough, solving each other's issues. The Black Widow film can focus on Black Widow doing bad things with her skills when she's young, being brought out of the darkness by Hawkeye, followed by defeating the person who forced her to do the bad things (in Budapest). It will flesh out both characters, their relationship with each other, and have a bittersweet tone underneath since we know how their relationship ends. All of the pieces for that story have been clearly outlined in the movies, I think they'd be foolish not to take advantage of it.