The problem with UUIDs is they are completely unreadable. Not just you can't understand them, it is prohibitively hard to even distinguish between them visually

The problem with UUIDs is they are completely unreadable. Not just you can't understand them, it is prohibitively hard to even distinguish between them visually. This is why identifiers which would not include any bit of information (or noise) beyond the necessary minimum are useful in some cases.