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The video tutorial discusses an issue with using SwiftUI's property wrappers and binding updates. It explains that a `didSet` property observer on an `@State` property works when assigning the wrapped value (like in a button action) but does not trigger with bindings (e.g., sliders). To handle changes in values correctly, the tutorial introduces a new modifier called `onChange`. This modifier allows you to specify a function to run when a particular value changes, providing the new value for your use. For example, you can use `onChange` with a slider to monitor `blurAmount`, allowing you to print the new value using string interpolation, ensuring proper output when the slider value changes.