I recently had a file with 1000 pages that had an image based watermark applied in a different PDF editor. I was able to remove it using a fixup through preflight that removed all images of that specific size. However, since the functionality exists already in Acrobat, there should be an option in the right click menu to delete image across pages. Such an option could automate deletion across multiple pages based on image size (like I did with preflight) or even image position, which is a data point that is available through the preflight analysis. That would make this functionality much more user-friendly for people who don’t want to waste an hour trying to figure out how to use preflight to do this.