The failures that hurt are never the ones that crash. A crash gets a stack trace and a fix the same day. The expensive ones return 200, render a normal looking screen, and sit there.
My own version was on iOS. A products fetch came back empty, so the purchase button stayed greyed out. No error, no log line, nothing to alert on. The reviewer found it before I did.
I build a product mostly on my own, with agents doing a growing share of the mechanical work. This year my output went up and my days got worse, and it took me a while to see why.
Automation ate the typing. It did not touch the checking, and it multiplied the number of things waiting to be checked.
Then I found telemetry that matches: Faros AI looked at two years of workflow data from 22,000 developers across 4,000+ teams. Task throughput per developer up 33.7%. Median time a pull request sits in review up 441.5%. Daily PR contexts per developer up 67.4%.