The advantage of the Marvel Cinematic Universe’s introduction of Spider-Man was that we skipped a big part of his origin. Most viewers already know the story of a kid that was bit by a radioactive spider. So, it made sense not to retread the same ground that the previous two entries did. Yet, it seems that while they had an idea of how they’d set the origin o the character, but never truly worked out the details according to director Jon Watts in Sean O’Connell‘s new book With Great Power.
I mean, God knows there would have to be something not unlike that, probably… But no, I wouldn’t say… I mean, I think he was bitten by a radioactive spider on a field trip. We never talked about that either, but I think that’s what happened.Jon Watts
It’s curious that they never set the idea of how he got his powers and does make you wonder if they are keeping it open to potentially explore it in the future. There are ties to the character of Silk that could potentially be explored if they wanted to return to the fateful day of the spider bite. Still, Watts was quite happy not to retread that same ground.
It was just so nice to skip past it and just deal with more with the repercussions… and just explore it from the perspective of someone else finding out about it and having a lot of questions.Jon Watts
That freedom definitely gave the trilogy a more distinct storyline, especially with how No Way Home essentially gave the MCU’s Spider-Man his Uncle Ben moment. While some hardcore fans weren’t the biggest fans of the character’s place in the bigger universe, it was a clever take on his mythos that combined older elements from the comics’ earlier days with some modern takes.
Source: The Direct