For example a UI with a simple image grid — of course you will need some images to visualize … and Sketch does it so good with the Symbol overrides for images. Also I use MagicMirror from time to time and it also works with pixels. I actually don’t agree that it’s a pure vector tool. But the issue I wrote about actually results from “many people in a team working on the same file”. People might just copy paste big images e.g. for a little thumbnail image. After a while you can’t control it well because Sketch doesn’t have an image library and if the image is an override you would just not see the image and its size.