Mistake: optimizing the sequence on opens and clicks instead of replies

Mistake: optimizing the sequence on opens and clicks instead of replies
Dashboards make opens and clicks the headline numbers, so people tweak subject lines to lift opens — a metric Apple MPP already inflated to meaninglessness — while reply rate flatlines.

The fix: make positive-reply rate the only optimization target. In Smartlead or Instantly, build reports on reply and interested-categorization, and ignore the open column. Test the first line and offer, not the subject.

Pros / Cons of reply-first optimization:
— Pro: you improve the thing that books meetings
— Pro: immune to MPP open inflation
— Con: replies are a slower, smaller signal — tests take longer
— Con: needs enough volume per variant for significance

Verdict: 4.5/5. Opens are a vanity metric wearing a lab coat.

Who it's for: anyone whose A/B framework still ranks variants by open rate.