From a business perspective, the GREATEST benefit of an incident response plan is that it:

The greatest business benefit of an incident response plan is minimizing the negative impact of disruptive incidents on operations and reputation.

“The primary business objective of an incident response plan is to minimize the impact of incidents on business operations and assets.”

— CISM Review Manual 15th Edition, Chapter 4: Incident Management, Section: Incident Response Plan Objectives*

ISACA practice questions reinforce that limiting impact is the key outcome from a business perspective.