When is Cloning the DB required in Development environment?

I have worked for DEV, QA teams, but they only need Schema refereshes(expdp/impdp). In OTN I always read threads about DB cloning for Development teams . When is a DB cloning actually needed for Development teams?

It's needed when you want to ensure that you have an exact copy, both physical and logical, of an environment. This is good for development environments because it provides more assurance that performance in development will accurately reflect performance in production.

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