What's the point of intraoperative narcotics?

Lets take 1 case and provide the anesthetic 2 different ways. Case: 45 year old elective lap colectomy, healthy with no cardiac history. Anesthetic option #1: Induction: prop only + paralytic. Maintenance: Volatiles at a MAC titrated up to 1.5 with neo drip or PRN squirts. Emergence: Drive off gas, give 100 mcg fentanyl at closure, reverse, extubate. Anesthetic option#2 Induction: 150 mcg fentanyl, prop, paralytic. Maintenance: Volatile at MAC 1, 50 mcg fentanyl every 30 minutes for... What's the point of intraoperative narcotics?
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