Does bulking optimization provided by LazyBarrierStrategy improves query performance?

I’m having a hard time understanding usefulness of the LazyBarrierStrategy which supposedly adds bulking optimization.
In the nutshell LazyBarrierStrategy simply adds barrier(2500) after FlatMapStep.
As I understand it means to execute previous FlatMapStep up to 2500 times before moving to the next step.
I hardly understand the usefulness of such barrier step being inserted after FlatMapStep. Do you know any use-case when LazyBarrierStrategy improves query performance anyhow or brings any benefit?
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