Arguably 'successfully' is relative- Windows 98, ME, Vista etc famously struggled with BSODs all the time. I imagine they were operating in relative blindness,

Arguably 'successfully' is relative- Windows 98, ME, Vista etc famously struggled with BSODs all the time. I imagine they were operating in relative blindness, basing their triage efforts on incomplete, angry user reports. They didn't have reliable information on which build was breaking, how many users were getting the same error, how frequently, on which types of hardware. With structured data they can prioritize fixes that affect the most users and verify their patches were effective.