Often I was asked to add tracking to new features I was building - I shivered. On one hand it wreaked havoc through features. Tracking scrolling and time spent looking at particular parts of the screen is not trivial. There were other parts of the app, if not done with tracking in mind, that resisted being changed. I reckon this has more to do with poor engineering than actual tracking. On the other hand, analytics without a purpose bother me. And this annoyance has stayed with me throughout the years. In fact it has developed to any field that requires a measurement, but doesn’t do anything with the results. Ask yourself, what’s the plan once you are tracking these numbers.