I totally agree with the author that Windows GUIs and MacOS GUIs are getting worse with every iteration. For my own side project I used ImGUI and it's working great for my purpose.

It's by far not as beautiful rendered as the native OS layers, but easy to navigate and a good foundation for cross platform GUI development. And I got it even approved for the MacOS app store. Here's my write up: https://marchildmann.com/blog/imgui-mac-app-store/