So every Batman related story has to start with Bruce watching his parents getting killed?
Every Spiderman related story has to start with Peter on a trip getting bit by a spider?
How many movies are we going to need to get to Nightwing or Red Hood if this is what we're saying?
As
@MartyMcFly said, you have good writing, you don't have to tell the entire story just to get to the arc you want to deal with.
Lord of the Rings movies, we didn't need a bunch of Bilbo Baggins/Hobbit movies beforehand to understand Frodo's development.
I'm watching Succession, a show about this old and sick media mogul and his family, how they're dealing with him and the business as his health declines. It's a dope show. I didn't need to see the main character as a kid to see how his parents raised him. I don't need to see him in high school and college to see how certain classes shaped his approach to business. I don't need episodes dealing with the love angle between him and his first wife, or a wedding episode, a couple of seasons showing how he raised his kids and how that affected their personalities, an arc of him starting his first business, divorcing his first wife, etc..
The story the writers want to tell is about an old and sick man trying to hold on to the business he created while his family is trying to figure out how to prevent him from fukking it up before they take over.