I currently set my terminals to production servers on a different colour scheme as a warning to avoid doing something wrong accidentally. As soon as I saw this feature I thought I'd use it to put a giant alarm sign as background image for production terminals.
I imagine it’s there to sort of show off, and prove that the terminal is finally hardware-accelerated (conhost.exe used GDI, which was CPU-only), where you get these features for free. There’s no reason to turn it on if you don’t need it’s though.
Who uses this? Why? Why is that worth the reduced readability?
I have a hard time wrapping my head around why such a feature would ever be implemented.
I guess... mischief? When somebody leaves their computer unlocked, you could set the background image to a screenshot of the terminal with a bunch of text. :-(