google-developers-lose-productivity-to-module-dependencies
Also, I lose productivity when I'm unable to see the effects of my changes quickly. It could be something as simple as getting the correct configuration on something which takes ten minutes to show any results (like deleting something from AWS's Cloudfront CDN). I got the path wrong twice and it killed me, because each time it took > 10 minutes to figure out I was doing it wrong.
"The conclusions of the article are probably correct, but it's important for analytics systems to have real time capabilities for debugging and iteration. When you're wiring up some new events or funnels you need to be able to click through and sanity check that you're collecting the data you expect. Maybe some of the desire for whole systems to be real time comes from this frustration."