Yeah yeah, it's "highly experimental" and all, but still, it's three times faster than simply running aws bla bla bla, the "plain" way.
And yes, it won't always be that fast, especially if you only run AWS CLI about once a fortnight. But it will certainly have a clear impact once you start batching up your AWS CLI calls; maybe routine account checks/cleanups, maybe extracting tons of CloudWatch Metrics records, or maybe a totally different, unheard-of use case.