> Every time you find one of those little gems your product owner brain goes all sparkly and happy, it jumps for joy and you see the future of the web unfolding in front of you.<p>That's the upside of the rollout process at Facebook, but the article completely ignores the downside which happens at the other end of an app lifecycle, when suddenly your app stops working because Facebook changed something, didn't document the change, and now you have no idea what went wrong or why and your users are screaming at the top of their lungs because they can't do what they used to be able to. That part of it doesn't make you sparkly and happy, let me tell you.<p>(In their defense, Facebook is getting better at documenting deprecations, but if you're at the bottom there's only one way to go...)