It's not about outages. It's about the why. Hardware can fail. Bugs can happen. But to continue a roll out despite warning sings and without understanding the cause and impact is on another level. Especially if it is related to the same problem as last time.
You don't need outages to build experience in resolving them, if you identify conditions that increase the risk of outages. Airlines can develop a lot of experience resolving issues that would lead to plane crashes, without actually crashing any planes.
