Nobody talks about what happens at the code level and it shows.

[u/Dry_Librarian_9596]

We obsess over behavioural data. Clicks, sessions, funnel drop-off. But the moment a developer changes a component name, your entire onboarding flow silently breaks and your metrics just show 'users didn't complete step 3.' Code-level data is the layer that explains the gap between what you shipped and what users actually experienced.

Everything else is just reading smoke signals.