For example, on the top line we don't have numbers for base characters but symbols like parenthesis and ampersand. And as weird as it looks, these are not always in prompt packs.
On Unity it doesn't matter if they aren't on the grid because the Sprite splitter will cut what it needs. I found a random sprite packer online, added a tiny 1px padding and it did the trick.
But yeah, it is required for some tech that are only working with atlases (Text prompts inluding images). So having those packed would be a great advantage !