Hi Osman,
The Pros of Auto activation is all objects which do not need any manual configuration will activated. But the problem is in one transport (and in one tpz) you might have some object which needs manual configuration before activation and in this case the auto activation is failed.
So i would suggest not to use auto activation feature for ID. Please refer the below SAP Note
1805662 - PI Communication Channel CTS+ transport error: Enter a value for attribute
regards,
Harish