Is it possible to do without using StateObject in certain scenarios?

Yes, in some scenarios, it is possible to do without using @StateObject.

@StateObject is intended for creating and storing an ObservableObject inside a View so that it persists across redraws. If the object is created and managed outside the View (for example, in a parent component or through Dependency Injection), then child Views can use @ObservedObject or @EnvironmentObject to access this object without needing to recreate it.

Example:

class Model: ObservableObject {
    @Published var value = 0
}

struct ParentView: View {
    @StateObject private var model = Model()

    var body: some View {
        ChildView(model: model)
    }
}

struct ChildView: View {
    @ObservedObject var model: Model

    var body: some View {
        Text("Value: \(model.value)")
    }
}

Here, @StateObject is used only in the parent View, and the child receives a reference through @ObservedObject. Thus, if the object is created outside the View or passed from above, @StateObject is not mandatory.