I work at the help desk of a university.
Student: "Um, yes, I'm using Powerpoint to prepare some slides for class tomorrow, and I wanted to know if there is a way to copy and paste a background from slide to slide."
Me: "Yes. In order to change the background image to a color or picture, all you need to do is right-click, select Background, and then select a color, image, or background effect to use. It'll let you select if you want the background to fill this slide or multiple ones as well."
Student: "That's too many clicks. I don't have time to click six times to get a background. All I want to do is copy and paste."
Me: "Unfortunately, Powerpoint doesn't do it that way, sir."
Student: "Yeah, well, I want to copy and paste, so it should. Could I fill a slide with enough text to turn it black? Then I could copy and paste it instead. I only want two slides black anyway. I just don't have the time for this many clicks."
Me: "As far as I know you can't do that, sorry. Maybe one day Microsoft will employ that particular feature but not yet. You could always email them a formal suggestion for it, though."
Student: "I just might do that."