Heatmaps seduce because they look like truth painted on glass. In practice, they are interpolations sitting on top of sampling choices, device quirks, and occasionally lazy tagging. We like them anyway—just not as oracles.
Our default is to ship heatmaps with blind-spot callouts: sections with low sample density, elements that move between breakpoints, embeds that steal pointer events. The callouts are small visually but loud semantically. They signal to leadership that you are not hiding messiness behind a gradient.
We also pair heatmaps with exit-node tables. Colors show where eyes linger; tables show where sessions end. When the two disagree, you usually find a layout debt story: a module that looks engaging but trains people to bounce early.
If your team is new to overlays, schedule a critique dedicated to false confidence. Walk through a page where the map lied—every organization has one—and translate the failure into checklist items. The ritual builds skepticism without building cynicism.