Example 1 Top-ranked hypothesis: "Verification emails are landing in spam/promotions folders post-redesign, not a user-intent problem." Evidence cited: drop-off spike correlates with redesign timing, not form-length reduction, suggesting an unrelated technical cause. Alternative explanation: users may be entering invalid/typo'd email addresses due to a new field layout. Data needed: email deliverability/bounce logs segmented by signup date, spam-placement testing. Low-cost test: send a test batch of verification emails through mail-tester.com to check spam score changes since redesign. Recommended next step: investigate deliverability before touching the form UX further, given prior form-shortening attempt showed no effect on this metric.