If you're using them for unguessable random strings then yeah, they're not ideal.

If you're using them for providing a unique id in a distributed system, with very little chance of collision & fitting them in a db column, then they are great.

Yeah I don't really get the point of this article, if you need random values of a specific size don't use uuid, it's literally specified to be one exact length and format.

one exact length and five "versions" of the format (so far)

https://en.wikipedia.org/wiki/Universally_unique_identifier#...

I made a comparison list with the most known uuids out there, a couple of days ago, it was quite fun discovering all the different kinds of uid and their pros/cons.

https://adileo.github.io/awesome-identifiers/

https://github.com/segmentio/ksuid