The un-modified delete key on a background layer brings up content aware fill as a way to improve discovery of the new technology. The team that implemented Content Aware Fill decided that most users would want to use the Content Aware Fill on background images rather than filling an image with an arbitrary color. On floating layers, the delete key will remove the pixels and create transparency, and [Shift] + [Delete] will bring up the Content Aware Fill dialog.
I realize that it is a new feature, but that should be an option, not a fixed feature you can't even change or re-arrange shortcuts to follow what we are used to for a long time, just my opinion, as you said, it should work on a background the same way as it does on layers, an option for content aware.
Not too happy, I guess I need to adapt. Thanks you for your response.
I agree, this is very annoying. I think the content aware team is wrong; most people are far more likely to want to fill the background layer with a particular color than work destructively on the background layer with content-aware fill. As for people not knowing about the new content-aware technology without this change in UI behavior, that is plain crap. Give me a break. Who is going to spend hundreds of dollars on the upgrade and not know about the flagship new features?