Yes, I believe the Windows UI (at least until 10 since I haven't tested 11 deeply) is becoming increasingly inconsistent because of the many UI frameworks out there. And, while I understand that each app's developer is free to choose whatever framework UI they feel is right for them, I find it hard to understand why Microsoft is not sticking with a consistent framework for all of its apps, it went even far by using Electron for its Teams app! However, the thing that I might never get is: Why is Windows itself (and its system apps, i.e Calculator, Notepad) isn't sticking to a single framework? Yesterday, at night, I turned "Dark Mode" on and was surprised to see that "Task Manager" keeps its Light theme. It's weird how Notepad++ has a "Dark" theme while Task Manager has not!
To "gratifies one's intellectual curiosity", check https://youtu.be/hn5QjtpjW_U