Why didn't Tony Stark use this system earlier?
In Spiderman: Far from Home, we see Tony give some of his technology to Peter Parker, specifically:
A massive, space-based swarm of killer robots, controllable through the Edith interface.
It seems that this system would have been very helpful, especially at the end of Endgame. Tony clearly didn't make it between Endgame and Far from Home. Are we given any indication as to why it is left unused until then?
Best Answer
Are we given any indication as to why it is left unused until then?
No
It's questionable as to whether the security drones would have been effective against Thanos' forces.
Certainly, assuming they were available, they would have been completely ineffective against Thanos' spaceship not to mention massively outgunned.
Then again, the climatic battle in Endgame is only a few minutes long and Tony has other things on his mind. Whether the drones (if available) could have deorbited in time to take part is debatable.
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Images: Field Engineer, Anete Lusina, RF._.studio, Rodrigo Santos