The article discusses the various layers of UI inconsistencies in Windows 11, ranging from Windows 11/WinUI3 elements to remnants of Windows 3.1. The author notes that while there have been improvements in design consistency, there is still room for improvement. The article highlights the presence of outdated UI elements from previous Windows versions, including Windows 10, 8, 7, Vista, XP, 2000, and 95/NT 4.0. The author concludes that Microsoft has made progress, but there is still work to be done to achieve a consistent UI.