Kevin Feige recently suggested that the MCU Peter Parker is going to stay in high school for a few films.
Do you guys think this is a good strategy?This is sophomore year, is the next one junior year?", Kevin Feige told Collider. "Is the next one senior year? Is there a summer break between each of those? I don’t know what, but it was sort of how do we do a journey for Peter not dissimilar for what the students of Hogwarts would go through each of their years, which was one of the early ideas we had for the movies".
One advantage is that it keeps Spider-Man distinct from the other MCU heroes, both the guys in movies and Netflix shows.