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If the user wanted to separate their leads based off a lead score, this is typically useful when not all jobs have to pass on a campaign for the lead to deemed valid.
The simple use case would be when filtering leads to a Call centre and an email automation platform, you may have the situation where email failed and telephone passed.
Therefore you don't want to invalidate the lead, instead you still want to accept it but integrate it to the call centre instead of the EAP.