Northbeam pixel tracking problems fall into three categories: implementation gaps that cause underreported conversions, cross-device journey failures that inflate certain channel credits, and post-iOS 14 modeling errors that compound quietly until your budget decisions stop making sense. Northbeam is a sophisticated attribution tool with genuine strengths, particularly for multi-touch modeling on complex customer journeys. But every pixel-based system has structural limits, and Northbeam's are specific enough that founders who know them can work around them. Those who do not often spend months optimizing toward numbers that do not reflect what is actually driving revenue.