While Spring Retry has an ExponentialRandomBackOffPolicy, Spring org.springframework.util.backoff only has ExponentialBackOff, with no random features. Since org.springframework.util.backoff is reusable on many projects (such as with RestTemplate, see #17922), this functionality could be generally useful.
Since Spring Retry isn't async, its utility is limited. And Spring Retry's ExponentialRandomBackOffPolicy is tied to its blocking implementation, with a call to Thread.sleep hard-coded in the only Sleeper implementation.
It could be beneficial for use cases which require async to have access to a general-purpose ExponentialRandomBackOffPolicy implementation.