In practice, using a unique IDs is often not ideal, but it also rarely the wrong choice. I've personally never heard of a scenario where a unique ID caused diff

In practice, using a unique IDs is often not ideal, but it also rarely the wrong choice. I've personally never heard of a scenario where a unique ID caused difficult to fix issues (although I'm sure it's possible). In contrast, a poorly though out natural key can cause a lot of headaches. This mostly occurs when your natural key isn't as unique as you thought, or if you have to change what you use as a natural key. The real world does not like to conform to our database constraints.