Stance
Engagement weighted list size is the only growth metric that means anything; raw list growth is vanity. An engaged list of 500 outperforms a disengaged list of 10,000. Optimise for attracting the right subscriber, not the most subscribers.
Why it holds
The classical metric of CRM, list size, is increasingly disconnected from the size of the audience you can actually reach. A database that is mostly dormant is not worth its headline count. It is worth the engaged subset the provider still routes your messages toward, and the dormant remainder actively drags reach for the engaged part. The mechanism is sharpest in email, where sender reputation is shared across the file, but the logic carries to any addressable channel: a push audience is the install base still opted in and opening the app, an SMS file the numbers that still respond rather than report. See engagement is the new deliverability for the mechanism.
Consequences
Measure engagement weighted list size
This is why engagement weighted list size is the growth metric to report. Raw list growth is mostly vanity.
- Discount led acquisition inflates signups with deal seekers who churn fast. See list building.
- Sunsetting dormant subscribers protects the active cohort rather than shrinking the asset. Run it as part of ongoing database health, not a one-off purge.