I thought it was fairly well reasoned in the article. Let's say you have a customer with that UUID as their ID. Do you expect them to recite their UUID perfect

I thought it was fairly well reasoned in the article. Let's say you have a customer with that UUID as their ID. Do you expect them to recite their UUID perfectly to you every time? What if they made 5 transactions, each with their own UUIDs and you need to look them up, do you now expect them to read out 6 fairly unwieldy IDs? The article is about the UX of UUIDs. Yes, there's a translation layer and more dev work to implement, but the shorter size and use of non-ambiguous characters is a massive improvement in the usability for the end users.