Why can't Tony Stark just get out of the Iron Man suit and then let his AI snap the fingers for him?

 

After the climax scene of AVENGERS : ENDGAME , people started discussing and fantasizing of different ways in which Tony Stark didn't had to die . And here is one such question :

Why can't Tony Stark just get out of the Iron Man suit and then let his AI snap the fingers for him?

In answer to this There are various reasons why Tony Stark did not use his suit remotely to perform the snap.

• There is no evidence that the Bleeding Edge nanotech suit is capable of being operated remotely. It seems like it has to be built around a user to function so even assuming that the Infinity Gauntlet can be used remotely the suit itself does not seem to have that function. I have a feeling after Ultron that Tony didn’t like the idea of suits that could operate without people in them.
• Speaking of using the Infinity Gauntlet remotely, what we see in the movies seems to suggest that the Gauntlet needs the wearer to be in physical contact with the stones to use them. That is why when they users put on the gauntlet they get infused with the power of the stones but when nobody is wearing the Gauntlet it is basically inert. Hawkeye, Spiderman, Black Panther and Captain Marvel all carry the Gauntlet around without it doing anything because they are not wearing it. Despite being dropped, thrown, bumped and knocked about the Gauntlet never accidentally goes off. Also if the Gauntlet worked without a user wearing it then why bother having Smart Hulk use it for the first snap in the lab? Just load the stones and have the Gauntlet snap in the lab with nobody wearing it. You have to physically be wearing the stones to use them.

(The Gauntlet is only active because Thanos is wearing it)

• Assuming that the Bleeding Edge armour could be used remotely and that it could somehow use the Infinity Stones the next problem would be that there is not enough time for Tony to leave the suit and get away from it before Thanos could react to his plan. He basically only had those couple of seconds while Thanos was figuring out what happened before the attack would resume again, this time without his armour to protect him. Thanos could either just kill Tony and deactivate the suit or he could go straight for the now empty suit and just take the stones. Thanos was able to fight Tony, Captain America and Thor at the same time, an empty suit and a normal unarmoured human would be no match for him.
• The moment that Tony wore the Infinity Stones he was pretty much dead anyway. We know that regular humans can’t wield even a single stone without severe effects. Peter Quill who is half human and half Celestial literally starts to burn up from the Power Stone. It is only with the help from the rest of the Guardians and his unique biology that he survives. Captain Marvel and Scarlet Witch, the only Avengers capable of going one on one with Thanos are powered by mere exposure to two other stones. Tony, a regular human being is holding all six at once. If you watch the scene with Tony’s snap you can see the power of the Gauntlet is already starting to burn him up. Energy from the Gauntlet is literally tearing up his armour and starting to eat away at his body. Any more time spent wearing the stones was going to kill Tony anyway.

(A single stone did this to a person who is half Celestial, imagine what six of them would do to a normal person)

• The outcome we see is the only successful outcome that Doctor Strange saw in Infinity War. Doctor Strange checked 14 million different possibilities and in they lost in everyone except the one in which Tony takes the stones and snaps. Presumably this means that in one or more of those realities Tony did try to remotely operate the Infinity Gauntlet and in all of instances it failed.
• The biggest reason is that in storytelling terms Tony Stark had to sacrifice himself to complete his arc. When we first meet Tony in Iron Man he is a selfish, self centered, self absorbed asshole. He only cares and thinks about himself and what he wants.
• Throughout the Iron Man and Avengers movies he slowly softens up and starts caring about other people. He starts with Pepper and it slowly expands to the rest of the Avengers, especially Spider-man and he begins to learn to put the needs of others before his own.
• However he still has a habit of making selfish choices even though they often end poorly; in Iron Man 3 he nearly gets himself and Pepper killed just because he wanted to provoke The Mandarin due to his ego, in Age of Ultron he creates Ultron despite everyone else warning him that it is a bad idea because he thinks he knows better and he is the driving force to breaking up the Avengers in Civil War due to his need to get revenge on for his parent’s deaths. Captain America even brings this up in Civil War

• When we see Tony in the beginning of Endgame he has lucked out, unlike pretty much all of the remaining Avengers he has most of the people he cares for deeply still in his life; Happy Hogan is still there, he and Pepper got married and have a daughter his only real loss was Peter Parker who had become like a son to him. In contrast Captain America lost Bucky and Sam, Rocket lost Groot and the rest of the Guardians who had become his surrogate family, Clint had lost his entire family. Tony had the most at stake but he helped the Avengers anyway, he could have left them and they possibly would have never solved the time travel problem and he would have carried on with his little world being intact. However he chooses to help them anyway knowing that he was risking everything.
• When it comes down to his snap that is the moment that he completes his story. There is no smarter solution that allows him to live. There is no other option. Tony Stark has to choose between himself and his happiness and the rest of the universe and he chooses the universe. For the first time in seven movies Tony put himself and his ego second. That is the entire point. He makes the sacrifice play. Tony has to die because that is the only satisfying ending to his story.

Basically Tony Stark couldn’t snap his fingers remotely partially because the rules in the film don’t allow for him to do so but more importantly because doing so would ruin his story arc.