HVIF does have level-of-detail hinting, and I believe it also explicitly defines the pixel exact correct rendering although given the small audience I won't swear they didn't miss anything.

So you can add a shape which just isn't rendered at all in lower resolutions. For example suppose the icon for your app is a stylised steam locomotive and you want to add your company logo on the side of the tank, this detail will look cool at 512x512 and maybe if the logo is simple at 128x128 but it will just be a blotch on the 16x16 icon - so HVIF lets you specify that the logo isn't added at all below say 128x128.