Mistakes?
No one wants to hear about "mistakes." That might open up the door to the possibility that they themselves are capable of making... mistakes.
What people want to hear about are "success stories." You know, things that haven't had to stand up to that most unglamorous and unforgiving of tests... the test of time.
As in, thinks like nodejs, heroku, and ah.. mongodb. After all: Why bother with perspective and overview, when you can just pad your resume with... keyword fodder?
Why, indeed?