Lacking quality insights can lead to several negative outcomes: 1. Poor Performance: Without knowing what works, your campaigns may consistently underperform. 2. Wasted Resources: Time and money spent on ineffective campaigns are resources wasted. 3. Subscriber Churn: Irrelevant or poorly executed emails can lead to higher unsubscribe rates. 4. Brand Damage: Poorly targeted or low-quality emails can harm your brand's reputation.