Why index tables by uuid?

Question

PostgreSQL

PostgreSQL database, where tables are indexed by uuid. These fields are generated as random, non-repeating numbers. The task is to determine that new records are added to the end of the table. I could only offer to add one more column index_id of integer values ​​and index the table on it. Tell me, with what intent are tables indexed by uuid?

Answer 1

Obviously, to quickly find by uuid.