Why is PillView not derived directly from UIView

[martindufort]

I'm moving forward with adding macOS comptability and wondering why the PillView contains a pillView UIView instance variable.
Why did you decide not to derive directly from UIView?

Something like this:

/// A `UIView` to display two forms of dynamic content based on the conditions or needs of a developer.
public class PillView: UIView {

Then we would inherit automatically the sizing information (width, height) and not have to forward those values to the inner pillView.

Let me know
martin