We’d been working on a redesign of our shopping cart for more than a year, and the time for the new release was quickly approaching. Up until this point, we had not conducted any end-user usability testing of the new checkout experience: so I took a week. We gave early access to 1000 of our most hardcore supporters, and conducted a survey to collect feedback. I analyzed the results and noticed a disturbing pattern in the comments and the log files:
How One Jira Ticket Made My Employer $1MM/Month: 7 Metrics that Actually Matter
Eric Elliott

It’s job of UX Designer, not Developer. I think your article not about wrong Agile, it’s about value of UX in Product Development.