I have used this guide on Medium to use the screensaver as wallpaper.
I just got a new iMac at work with macOS v10.13.6. and was intending to do the same. But running the command in terminal with -background doesn't open the screensaver in the background anymore. Instead it's opening it in the front. I can still click stuff on the screen, but I can only see the screensaver.
Does anybody knows if the -background flag has changed?