I have to second this…the extra step while meaningful is more often than not just that, an extra step.
Making this option say in the printer setup would be nice.
What would be even better…use the camera and maybe a photo taken as the previous print finished and when it started and use that with a current photo to make a good guess if the bed is not cleared…if not clear then present the dialog.
I always start with the bed in a specific position (bed at max Z, hotend centered), and the first layer always starts in a fixed position (bed very near hot end with end at 0,0) and the bed photo looks the same at both those points although they differ from each other. And for sure once a print is completed the picture looks totally different. If before the clear message was issued it compared the current bed picture to the start position (before it moves bed near hot end) then it could tell if the bed was clear. Alternately if it snapped a photo of the print as it is completed and compared that to the photo before the print starts it could probably tell if the bed has at least had the last print removed. I know image comparison is not a trivial task but it would be a cool feature.
Barring all that maybe just a picture of the bed now and a quick second click on print or clear bed button to continue would be handy…then when I am not standing at the printer I could see if the last user left the bed clear or not.