I presume you are referring to UUIDv4/1, which has 122 random bits. It is a common misconception that this is insecure. In reality, the UUIDv4/1 is just a way to encode 122 random bits, which is more than enough for most needs. The property of being practically unguessable comes from the random generator, not from the encoding.

Secondly, whether or not being predictable is a problem depends on the use case. The keys used on this forum are predictable and it is not an issue.