Bundle attach rate increases as a reported metric, but the attached products are not being used by the customers who purchased them. Attach rate measures the sale of the bundle, not the adoption of its components. When attached products go unused, the revenue is fragile — renewal risk accumulates invisibly because usage signals that would surface churn intent are absent.
Renewal conversations arrive without warning because low usage on attached products was never surfaced — the attach metric reported success where the customer experienced none.
Bundle attach rate stops being a reliable indicator of expansion revenue health or renewal probability.
Bundle attach rate is rising while product usage data for attached components shows low or zero engagement from the same cohort. Renewal rates for bundled accounts are not materially higher than for single-product accounts — or are declining — despite the attach rate improvement.