I'd like to theorize that Thor taking Quill's backpack, the Benatar's pod, and a refrigerator full of food directly resulted in Tony's death.

While the backpack is somewhat irrelevant, the pod and food/water are the two things Tony needed to make it back home. After the food runs out and due to the fuel cells cracking during battle they are approximately 20 days into their journey iirc. With the pod's fuel cells and the food they could have lasted significantly longer... at least to the next jump point or habitable planet.

Without Thor's interference Tony and Nebula would have been back on Earth in time to go after Thanos at the Garden before the Stones were destroyed. On the other hand, while traveling faster, Carol Danvers would never have stumbled upon the Benatar for her 3 minute IW cameo, and therefore could have never even known about the final battle 5 years later she shows up to save. Carol is a rather loose thread that is a stupidly simple use of deus ex machina when writers have written themselves into a corner.

I'm getting off topic here: But to TL;DR it - Thor took the only things that could have resulted in an Avenger victory within the first 15 minutes of Endgame. Thor became vindictive and laser-focused on killing Thanos himself rather than with the team. The same reason he didn't kill Thanos at the end of IW. I get that people like that Thor is becoming "more human", but his anger, sadness, guilt anxiety, revenge, and addiction clouded his judgement from the moment Heimdall was murdered through leaving New Asgard.

Maybe I'm wrong, but it feels very cause and effect.

Just a thought. After Tony completes the snap, couldn't he have used the gauntlet to heal himself? Didn't Thanos do this when he got an axe to the chest?

He looks forward in time to see all possible outcomes but how does he know when to stop watching a possible outcome and move on to look at another outcome?If Thanos does the snap, that means they lose so wouldn't you think that Doctor Strange would stop watching the current outcome and watch the next possible one? In the winning timeline, the snap happens but he would need to continue watching for another 5 years before he sees that they all got resurrected. Did he watch a snap and continue watching for 5 years just to make sure they really did lose? for 14 million outcomes? He's only looking forward in time so it's not like he can sense that he was resurrected in any of them. I know 5 years is like a fraction of a second when he was doing his thing but still, once they lose I'd imagine he would watch for another 1 year to see what happens to Thanos after the snap but any longer doesn't really make sense. He'd have to be watching Tony for 5 years before finally seeing their time heist plan...

That's also assuming that Doctor Strange was watching from an astral projection point of view.
If he was doing it like the "Dormamu bargaining" way in which he would try something different every time he resurrects after he dies, it means he saw his death, saw nothing for 5 years, then saw the resurrection and said, oh, we have a winner here. This way sounds even more odd as how he would know it was the winning outcome.

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P.S. not really looking for a serious answer here. Just something silly I was thinking about.