At Google you can ask your coworkers to write feedback that would be included in your promo package. I wonder why the author didn't ask the developers that they

At Google you can ask your coworkers to write feedback that would be included in your promo package. I wonder why the author didn't ask the developers that they helped to write a few sentences explaining how much time they'd saved thanks to the author's help. The hiring committee wouldn't ask for any metric if there were already a few people testifying that "I saved XX hours". Disclaimer: I work at Google.