Here are some reasons for using UUIDs; not apply to all businesses:

- client-side generation (e.g. can reduce complexity when doing complex creation of data on the client side, and then some time later actually inserting it into to your db)

- sequential ids leak competitive information: https://en.wikipedia.org/wiki/German_tank_problem

- Global identification (being able to look up an unknown thing by just an id - very useful in log searching / admin dashboards / customer support tools)