That is a cool trip down memory lane. Not only macOS, but also when updating Linux distributions it is always fun to see new eye candy on the desktop.

Apple has excellent photos and other wallpapers, I would be (slightly) curious what percentage of people just stick with the default?

Off topic, but I like to use my own pictures of places around the world where my wife and I have travelled for desktops. I also like to use high resolution pictures I have taken of favorite art work I have purchased.